Earlier quoted context omitted.
I’d argue your team really shouldn’t grow too big if you want to remain effective. 4-8 people seems to be the sweet spot in my experience.
The truly difficult bit is making an organization with 100 or 1000 different 4-8 people teams to build something more complex. There is a vast array of problems that need solving that just can't be tackled by one 4-8 person team.
The solution to which you speak is microservices. No, not some misguided multi-process IPC technology model that seems to have tried to usurp the name, I mean real microservices. The people model. Where each 4-8 person team continues to act if they are an independent businesses, even if they legally work for a single organization.
It's not particularly difficult. The macro economy, which operates at an unfathomably larger scale, shows how easy it is. But, indeed, it can be uncomfortable for some people to not feel like they have full control over an organization.