When you consider you get an ARM linux machine with a SSD (compared to an SD card), it's mind bogglingly good!
Eh, there's mechanical keyboards and then there's mechanical keyboards. Boards with a basic plastic construction similar to the Pi500+ can be had for much cheaper, while for the cost of a Pi500+ you can get a super fancy CNC machined aluminium brick of a keyboard.
plus you can make a keyboard that actually works as a keyboard and not just for the pi
I have a lot of mechanical keyboards, and honestly I prefer plastic over aluminum. I don't really understand the allure of all that heavy metal. The new 8BitDo one is a good example of a "premium" mechanical keyboard with a plastic case and it sounds and feels amazing.