Nobody needs a mechanichal keyboard, keyboard buttons working with a key system like light switchs. When you press a key, key works and computers know you pressed the button.
Mechanichal keyboards is diffrent from standart membrane keyboards, but every key has our own key switch, as you can see the name. So, in fact there is no any diffrence. But they are more expensive and they are trying to do a hype for mechanichal keyboards.
If you ask me I don't recommend RGB keyboards, they can slightly harmful for eyes. But if you choose one color from RGB, so stabile color I think they can be cool.
Anyways, also they are too loud and useless. Also after a time switch's getting old and starting to repeat the button twice while pressed once. So they are expensive, weak life time and cool looking keyboards.
I using a very old membrane keyboard, it's awesome comfortable. The best keyboard is your best keyboard, not the market's.