

This makes me think of my late grandfather. He had been a civil engineer for the US Navy who spent several years working in the Panama Canal Zone. He told me this story of a senator showing up one day with cost-cutting on his mind. He focused on one line in the budget: mosquito control. “Mosquitoes? There are no mosquitoes here! What a colossal waste of money!” The whole area became pretty much unliveable within a year of his returning to Washington.
I work with 32MHz microcontrollers at work and you can do plenty with them. It’s a different world from say general CPUs where speed is king. You’re often more concerned about timing reproducibility than outright clock rates. There are also considerations about power consumption, electrical noise, functioning in extreme environments, etc. that may inform your decision to go with one controller over another.