Why are mechanical keyboards so popular. I git told you only buy cheap once then get the most expensive
Some newer mechanical keyboards can use optical keys which means you can essentially set up some keys to act like controller trigger keys, if you choose. It allows the activation point where the key registers to be set by the user instead of pre assigned.
Thats one reason.
Generally Mechanical keyboards from big names just sell them based on rgb or features. Smaller companies think about improving experience or customising keyboards.
Some Mechanical keyboards have dampening foam in them so that when you type they make less noise.
Some let you swap the keycaps or switches.
Some only come as chassis and let you choose all the parts you want in your keyboard, to make it truly unique.
My last 4 keyboards have been Mechanical. First 3 were from big brands and most of those don't allow swapping anything. The current one let me choose the colour of the keycaps and what switches I wanted in it.
Being able to replace almost all the parts in my keyboard means it should last a long time...