some of the interest is aesthetic.
however, mechanical switches are different than laptop keyboards because you don't have to press the switch all the way down to activate it. slamming your fingers to a hard stop is straining, so to avoid bottoming out you want to know when a keypress was registered so you can let go before you hit bottom. for some people the clicky feedback is important.
since smell and taste are hard to relate to typing, there's 3 possible routes for feedback. tactile switches (which also make noises), clicky switches (which often have both have a sound and tactile component) and touch typing (look at the screen and see the character appear, instead of at the keyboard).
having feedback on multiple channels may make it easier for the brain to do the right thing, even when you are semi-inattentive, e.g. looking away at a second monitor, daydreaming, etc.
there are also people who use heavy springs to avoid bottoming out, but this is still more tiring to the fingers. and people who use dampers/orings to soften the bottom out. i can't call then wrong but I've preferred the route of learning to type more gently and precisely with speed switches that have a short activation distance and light springs.