>suddenly you have tons of teams working on what seems to be fairly niche aspects of the company's product
At scale it tends to be worthwhile, even necessary, to engage fully with the complexity of all those "niche" aspects.
When you don't understand how something could possibly take so much effort, it's possible all the people working on it are idiots and you could do it better in a weekend. (When you spot situations like that, think of them as startup opportunities...)
It's also possible they're doing a good job hiding the complexity from you.
At scale it tends to be worthwhile, even necessary, to engage fully with the complexity of all those "niche" aspects.
When you don't understand how something could possibly take so much effort, it's possible all the people working on it are idiots and you could do it better in a weekend. (When you spot situations like that, think of them as startup opportunities...)
It's also possible they're doing a good job hiding the complexity from you.