250k wouldnt be what they're paying, on average, it would be pay plus all other employee related expenses.
I have to assume the managerial positions vary greatly but that average seems about accurate, even if most of the manager salaries are high, 5 figures, low 6 figures. Managers in AWas (L5/L6) are making over 250k in many locations.
Why do you have "5 or 7" apps? Being able to communicate externally, with consistency, is the reason for email, that's it. If anyone sends me an email with a question or comment that isn't hyper specific I immediately tell them to go post in a relevant slack channel so others can search for the question/comment in the future.