Coordination cost grows faster than headcount.
Every person added brings relationships, handoffs and decisions, and those grow faster than the number of people does. At fifteen people everyone knows what everyone is doing without being told. At fifty, nobody does, and the mechanisms that used to be free now have to be built.
This is why growth frequently feels worse before it feels better. The extra capacity is real, but it arrives after the extra coordination cost.
The owner becomes the bottleneck, structurally.
Not through reluctance — usually the opposite. Responsibility gets delegated while the authority to act on it quietly does not, so every decision comes back up for approval.
The test is simple: ask a manager what they can decide without asking. If the honest answer is "not much", you have found the constraint, and hiring more managers will not move it.
Processes that lived in people stop scaling.
At small scale, "ask Dave" is an efficient process. Dave is right, Dave is fast, and writing it down would be slower.
At fifty people Dave is a bottleneck, a single point of failure, and an unintentional gatekeeper. Worse, every new hire is trained by a different person with a different version, so the process silently forks.
Reporting starts producing arguments.
Two systems disagree about a number and a leadership meeting turns into a debate about the data instead of a decision about the business. This is almost always a definition problem — the same word means different things in two places — and no dashboard fixes it.
Fixing definitions is unglamorous and it is the work. A small number of measures everyone calculates identically beats thirty charts nobody trusts.
What to do about it.
Find the actual constraint rather than the loudest complaint. They are rarely the same, and the loudest one is usually a symptom of the quiet one.
Give recurring outcomes named owners, and confirm each owner genuinely holds the authority to influence the thing they are accountable for.
Move the processes that live in people into systems they can be handed over with, starting with the ones a single person carries.
Fix the measures before building reporting on top of them.