Agency Unbundling Is Here: What B2B Teams Should Keep In-House

Forrester’s latest B2B agency research points to a shift that many marketing leaders are already feeling: agencies are not disappearing, but the default retainer is losing its strategic status. 93% of respondents use agencies in some capacity, according to Forrester’s 2026 B2B Brand and Communications Survey (research summary). Yet the share expecting agency budgets to increase fell by 13 percentage points, according to the same Forrester research (survey summary).

That is not a case for firing your agency. It is a case for stopping the lazy agency-versus-in-house debate. The better question is: which capabilities should your company own because they compound learning, and which should you rent because they are specialized or repeatable?

The agency model is being unbundled

The old setup—one agency handling media, creative, reporting and “strategy”—made sense when campaigns were episodic and channel expertise was scarce. It breaks when your growth motion depends on a tight loop between ICP insight, positioning, sales feedback, creative testing, CRM data and revenue outcomes.

McKinsey’s operating-model guidance makes the useful distinction: keep strategy, brand direction, customer understanding and critical decisions close to the business; use external partners for execution, specialist expertise and experimentation (McKinsey). The implication is practical: an agency should not own the definition of your best account, your qualified pipeline event or the message sales uses to displace a competitor.

This also connects to the broader commercial shift described by Harvard Business Review: the serial marketing-to-sales handoff is giving way to integrated commercial work (HBR). A media partner that optimizes clicks while your sales team measures opportunities is not an operating model. It is a reporting gap.

Keep the learning loop in-house

For a B2B SaaS company, four assets should generally remain internal:

• ICP and positioning: Your team owns the customer problem, buying trigger and competitive contrast. Partners can sharpen the expression, but they should not be the only place that knowledge lives.
• Revenue definitions: Marketing, sales and finance must agree on what counts as a qualified account, opportunity and revenue event. An external dashboard cannot resolve internal disagreement.
• Budget decisions: Channel allocation is a commercial choice, not a platform optimization setting. The owner needs to see capacity, pipeline quality, sales cycle friction and payback together.
• Experiment memory: Keep a searchable record of hypotheses, audiences, creative, landing-page changes and downstream outcomes. If an agency leaves and your learning leaves with it, you rented a black box.

This is why the strategic layer matters more than the execution layer. The execution can be moved, split or automated over time. The learning loop compounds only when your team owns it.

Rent execution with a sharper contract

Agencies remain valuable when the scope is bounded and the output is inspectable. Good use cases include launching a new channel, producing a burst of creative, solving a measurement implementation problem or adding specialist capacity during a major GTM push.

Bad use cases are open-ended ownership of “performance,” vague monthly strategy hours or reporting that stops at platform metrics. Those arrangements hide whether the bottleneck is media, offer, creative, sales follow-up or market demand.

Rewrite the brief around deliverables and learning. Require a weekly view of what changed, why it changed, what the data suggests and what the team should test next. Give the partner access to the context needed to make good decisions, but keep the source-of-truth definitions and final allocation authority internal.

What to do this week

1. List every agency deliverable and label it strategic, specialist, repeatable or learning-critical.
2. Move ownership of ICP, positioning, revenue definitions and experiment history to named internal owners.
3. Convert vague retainers into scopes with decision rights, handoff rules and learning deliverables.
4. Review agency performance against pipeline quality and commercial learning—not just leads, clicks or platform-reported conversions.

The future is not fully in-house marketing. It is a better-orchestrated system in which your company owns the decisions that compound and buys the capacity it can evaluate.

For the paid-media implications of that division, see Performance Max for B2B: The Exclusion Stack That Stops the Waste. For the broader budget question around answer engines and B2B visibility, see Answer Engines Now Build the B2B Shortlist. Reprice Your Budget..