Enterprise buyers are right to look closely here. Problems usually start when the delivery model is vague, not when the engineers are incapable.
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Unclear boundaries
If nobody knows exactly what the team owns, scope spills across teams and accountability disappears when delivery gets harder.
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Extra process
Some external teams bring their own rituals, reporting, and release habits, which creates a second delivery system around the work.
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Hidden dependencies
Upstream systems, approvals, and handoffs are often discovered too late, when the work is already under pressure.
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Weak handover
Something may go live, but the documentation, runbooks, and ownership transfer are too thin to support the next release with confidence.