Mechanical keyboards seem like a example of creating a need through advertising instead of filling an existing need[0]. It worked well enough that I bought a $100+ mechanical thinking I was missing out. In a way you do get what you pay for since mechanical keyboards tend to last longer. But other than that they are not quantifiably better. For me I noticed my typing speed was reduced even after using it a couple weeks, so went back to low profile rubber dome and never looked back.

[0]: Actually I do not know the history here. What started the rush for mechanical keyboards? It feels like there was a point in time where they became fashionable, I assume it had to do with advertising campaigns but it could have been organic interest too.