- Noise
- Pleasant to use
- Accurate
The real reason is because the author is a hipster programmer and wants to elevate his status. It is well known that "real" coders who set up ISP's in the 90's and accomplished other badass feats of superhuman programming use clicky keyboards (https://workplace.stackexchange.com/questions/40897/how-do-i...).
This goes back to the bullshit nature of most technology jobs. It is such an empty life to work on abstract intellectual problems with no discernible results in the real world, as noted by David Graeber:
"Crucially, the realization brings a delight, the pleasure at being the cause, that is the very foundation of our being." - https://harpers.org/archive/2018/06/punching-the-clock/
The key (pun intended) component here is the theatre of a loud keyboard. It FEELS like you're getting work done! The author readily admits it, "This thing is loud, which really makes me feel like I'm getting serious work done when typing."
So the noise and being pleasant are really one in the same. The feedback make him feel better about being able to make something that produces change in his environment. Even if he is his own audience and only fooling himself, that is enough.
Finally, I question the accuracy piece. I grew up typing on mechanical keyboards, and therefore can appreciate the haptic sensation and noise aspect, but I'm happier with my keyboards' accuracy today. Most of my typing errors are not an issue of incompletely depressing a key, but typing the incorrect key. Mechanical keyboards do nothing for improving this kind of accuracy.
Theatrics for an audience of one. That is the reason. Plain and simple.
(edited for formatting)