Why Agencies Fail at Building Products

TL;DR: Agencies are structurally optimised for delivery milestones, not product outcomes. They disappear right when the product needs the most attention. The venture builder model - shared risk, shared upside - aligns incentives so everyone cares about whether the software actually works.

At Carro, we hired branding agencies more than once. Every time, the deliverables looked polished - nice decks, clean guidelines, professional typography. And every time, the result felt off. Not because the work was bad in isolation, but because they just didn't get it. They didn't live the brand. They didn't understand what we believed or why we built the way we did. They'd spend weeks on discovery workshops and still produce something that could've been for any company in any industry.

The gap wasn't effort or talent. It was understanding. And that gap is even wider when it comes to building software products.

The Incentive Problem

Agencies bill by time or by project. Either way, their incentive is to deliver what was specified, not to build something that works. These sound like the same thing, but they're really not.

What was specified is a document written before anyone built anything - before you discovered that the workflow has an exception that happens 30% of the time, before you realised that users need the dashboard to load in under two seconds or they'll ignore it, before the market shifted and the original requirements became partially obsolete. A good product evolves. An agency contract doesn't.

I've been in rooms where agency PMs nodded along to requests they knew were wrong, because disagreeing might risk the contract. That's not a people problem - it's a structural one. When compensation is tied to delivery milestones, the rational behaviour is to hit those milestones as efficiently as possible. Push back on scope changes. Minimise discovery. Ship what was agreed upon and move to the next client.

The Handoff Problem

The moment an agency delivers your software, they're already working on their next client. Your project is in maintenance mode - the B-team, the junior developers, the "log a ticket and we'll get to it" phase.

But here's the thing: day one of delivery is day one of learning. That's when real users hit real workflows and you discover what actually needs to change. The first three months after launch are when the product needs the most attention, the fastest iteration, the deepest understanding. And that's exactly when the agency's attention is somewhere else.

So the product stagnates. Users develop workarounds. Slowly, the team drifts back to whatever manual process they were using before. Not because the software was bad, but because it stopped improving at the moment it needed to improve the fastest.

A Different Model

The venture builder model exists specifically to solve this. Instead of a client-vendor relationship with a defined scope and timeline, it's a partnership with shared stakes. When you're building together - and you both succeed or fail based on the product's success - the dynamic changes completely.

You say no to bad requirements. A partner once wanted us to build a custom reporting engine with 47 configurable chart types. We said no. Built three charts that covered 90% of their actual decisions. Shipped two months earlier. An agency would have built all 47, and the users would've ignored 44 of them.

You care about adoption, not just delivery. Shipping code is maybe 20% of the work. The other 80% is change management - training, SOPs, embedding the tool into daily workflows. An agency's scope ends at deployment. For us, that's where the real work starts.

You iterate based on reality. When you're committed long-term, you watch how users actually behave, not how the spec said they would. You fix the friction points. You add the features users ask for in the first week. You remove the features that seemed important in the brief but nobody touches.

And you don't disappear. Six months after launch, you're still there. Still building. Still invested in the outcome.

Research from the Global Startup Studio Network shows that venture studio-backed companies have a 30% higher success rate than traditional startups. Studios reach Series A in 25 months on average, compared to 56 months for the traditional path. I think that's because the model eliminates the three biggest failure modes: misaligned incentives, knowledge gaps, and post-launch abandonment.

How to Tell the Difference

If you're evaluating who to build with, here are the questions that separate agencies from partners:

• What happens after launch? If the answer involves a "maintenance retainer" or "support SLA," that's an agency. A partner's answer is: "We keep building."
• How do you handle scope changes? Change orders and re-scoping means agency. "We figure it out together" means partner.
• What's your incentive? Billable hours or project fees means they're optimised for delivery. Tied to the product's success means they're optimised for outcomes.
• Have you operated in this industry? An agency will say they've "worked with clients in your space." A partner will tell you war stories from the trenches.

The best software gets built by people who have something to lose if it doesn't work. Not by people who get paid either way.

We're the kind of partner who stays.