I guess it depends on the type of developers. If we are to generalise I believe that we would let about ~25 (or a quarter) just create new things on their own,

I guess it depends on the type of developers. If we are to generalise I believe that we would let about ~25 (or a quarter) just create new things on their own, like let them ideate, and build their own ideas that can possibly be big or really innovative things (obviously aligning with the company mission/objectives). You can see very often the creativity of developers being absolutely suppressed by boring or very straightforward/linear projects that leads to very little excitement from the people developing or implementing them. The rest would probably go to making those potential bold ideas happening and keep on building a great product with input from users. note: this is possibly only viable with a large enough number of devs (>100) and enough money to spare.