It's not like they ever stop making old versions (except for the original prototype), there are perfectly valid uses for a Pi 3/4 or even a Pi 2 still today. If

It's not like they ever stop making old versions (except for the original prototype), there are perfectly valid uses for a Pi 3/4 or even a Pi 2 still today. If you need something more basic, those are good options and far more efficient/reasonably priced too. The Pi 5 seems to be aimed more at the high end heavily demanding tasks, after all it uses 3x more power than the Pi 4. It's not meant to replace it and it should be equipped accordingly for its role.