By "functions", do you mean software features or human business roles?
Discussion
should be the lack of personnel function.
Most non-dev software roles scale really well, like marketing, sales, dev-ops, test, customer support, analysis, etc.
That's why I keep encouraging the devs to form project teams, join project teams, or combine/integrate project teams, so that they can "afford" to set aside or recruit some resources for these other roles. Or latch onto a group that already has them all (like ours), and make yourself useful.