alt Hacker NewsMX switches are the entry point of the "mechanical keys". You can go into way too many rabbit holes beyond consumer brands like Das Keyboard.
There are topre capacitive switches (HHKB, Realforce etc) , buckling spring switches like the ones in this post (& older IBM model M, Unicomp), Alps switches (older mac keyboards, matias), and an endless selection of MX compatible customized switches. All with different tactility and sound profiles.
Merely "having mechanical keys" is a very basic criteria especially for enthusiasts who might have very specific requirements and preference for how their keyboards should feel and sound. This one is mainly targeted towards those enthusiasts.
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Mechanical was always a dumb name. A collapsing rubber dome is a mechanism anyway.
It's a real shame that the world standardized on MX and ALPS has been left in the dust.