My humble experience so far: https://kcross.engineering/blogs/matrixandmautrix/
Biggest thing so far is "go slow on federation". Large federated servers are where you get into trouble with resource requirements and needing to spin up workers, etc. Small, private servers are relatively easy.
False dichotomy, my guy - why not call out both the civil rights violations and their basic idiocy? Some people wouldn't be swayed by "the department of education ensures equity in education" but would be by "the illiterate are tearing down education". Just because a single person didn't mention every single thing going wrong every time they comment doesn't mean they don't care about stopping every bad thing.