The whole deal with mechanical keyboards feels to me a lot like putting too much emphasis on the rig without real justification. Sure extremely skilled people do need the extra performance in some circumstances, but chances are the rig is not used by extremely skilled.
And have seen it in a lot of fields and I've actually been culpable of it:
* competitive sailing: I've done quite a bit of dinghy sailing and regattas in my youth (Optimist, Laser, 420), I was always a bit frustrated because as I was not very good, I never had the best boat allocated. But in truth, as long as your dinghy is somewhat water tight and your set of sails are not blowing-up when a strong wind occurs, you are set, at least for a regional and even national level (one of my trainers actually won a national championship on a garbage dinghy that was laying around abandon in a parking lot).
* music (guitar): I've spent countless hours on forums arguing about guitars, amps, effect pedals and things like that. Today I own a Fender Telecaster (Made in Japan, not a US one), a Les Paul Classic, two tubes amps (one I've built, the other I've repaired). All that is far in excess of my actual skills. And I've seen far worst than me, I've literally guitarists barely able to play (like not being able to play 4 cords in rhythm) with 5000$ guitars and 3000$ amps.
* photography, I've seen people with 5000/6000$ (and more) worth of hardware (like Canon 7D or 5D + 2.8 80-200 IS USM + a few other lenses) not being able to frame correctly a picture. And personally, I'm far from good but I do own a second hand 5D (mark I) and a 17-40 L, and the best set of picture I've ever taken was with an old analog AE-1 with a 1.8 50mm lens that cost me 80 bucks during concert.
* mechanical keyboard: I do own a few mechanical keyboards despite the fact I'm barely able to type without looking at my keys (and I've tried to learn several times to type correctly without success using klavaro), and having a very slow word per minutes. I spend more time reading and thinking than typing so in the end, it doesn't matter that much.
Clearly, I'm not the worst at it, but I'm definitely culpable. That being said, having a nice and expensive rig do provide for more pleasure in a lot of cases (ex: between a 150$ and 1500$ you do feel a difference, the touch is not the same, the wood vibration are not same, etc), and it's completely OK to allow yourself these small pleasures.
However, acknowledging these small pleasures as such is important, a cheap guitar is fine, a cheap camera is fine, a cheap keyboard is fine, etc, no need to be pedantic about it. In the end, it rarely matters that much.
PS: cheap mechanical keyboards are actually kind of horrible, I've a 30/40$ one with MX browns copies, the thing is really annoying with key presses resulting in two or three letters being typed, shift+char not always working properly or sometimes a key press resulting in nothing.