Because different people are productive with different tools. I think your reasoning is completely backwards on this: it’s not expensive to support many differ

Because different people are productive with different tools. I think your reasoning is completely backwards on this: it’s not expensive to support many different sets of tooling. No, what’s expensive is paying a lot of money for people who can be very productive for you, but then preventing them from giving you that productivity due to poor tooling. When the poor tooling has been standardized, your good developers are heading to the exits.