I think I'd actually say that browns are more popular than blues. They were being put into so many keyboards for a while that they were perpetually out of stock (hence the price hikes). I don't mind a noisy keyboard (at home, that is—I wouldn't subject my coworkers to that) but I just wasn't too crazy about how blues sound. I prefer a clack rather than a click, which is why I love the sound of buckling spring keyboards.
There's quite a bit of nuance between switches when you look beyond genuine Cherry switches (in addition to the Zealios switches I have installed, and the Holy Pandas I have on order, I joined a group buy for some Everglide Dark Jade switches…I need help) but that's also when things tend to get really, really complicated. Cherry switches are fairly easy to identify, have a fairly simple lineup, are ubiquitous, and are cheap. I find non-Cherry switches to be superior, sure, but you're never going to be able to find a keyboard that uses Zealios V2 switches for under $100. You're going to be lucky to get just the switches for that much.
That said, when I first got the keyboard, I didn't really like it since I was so used to the other one I used for 18 years. It probably took a few hundred hours of use (even durring my initial 1-60 in classic WoW I wasn't totally comfortable with it) to finally get used to the thing. NOW THAT I AM USED TO IT, I really enjoy the feel of the keys and smoothness the reds have going for them. Especially when say moving a character in a game, not having any click or bump or actuation feels kinda good, very smooth.
If it works, it works.

My main reason for preferring a tactile bump is because when I anticipate a future movement I tend to put some pressure on the key, so having a switch with a 50-55gf actuation force feels just about perfect for preventing accidental movements. I used MX Blacks for almost a year and even after all that I couldn't get used to the linear travel.
As far as making the initial switch, I found that the toughest part about getting used to a mechanical keyboard is adapting to the high actuation point. You have to almost completely bottom out rubber dome keyboards in order for them to register, and they're rarely smooth. Many of the rubber domes that I've used have a hard break near the top of the travel, a gritty descent, and feel mushy as they bottom out, which leads to them requiring a lot of actuation force at the beginning of travel, then having to deal with the actuation point being significantly below that. I've grown to loathe the way they feel, though I admit that Dell made (rebadged?) some good ones around 2005-2006ish. Honorable mentions include the Apple Pro Keyboards from around 2003-2004 (those tend to be very smooth), and this one random Compaq PS/2 low-profile rubber done that I ended up acquiring at some point (feels surprisingly crisp and responsive).
I don't mind scissor switch keyboards since they tend to be crisper and have less travel. Some of the Apple low-travel keyboards (Magic Keyboard 2 and the newer MacBook Pro keyboards) are downright pleasant to use for what they are. It helps that they have an aluminum backing plate, which helps them feel reasonably snappy.
Problem comes with now that I'm well and used to this thing, and I know reds are treating me well...I don't think it would be worth money, or more importantly time to trial and error all the other options available. Mech keyboards are expensive enough for one, let alone like 9.
I managed to sell the ones that didn't self destruct, at least (the 6Gv2 and the G910).

Right now I'm using the GMMK TKL for my gaming PC and WFH setup, my IBM Model M for my DOS/Win98 retro PC, and my G710+ is sitting on my currently-abandoned desk at work. As far as non-mechanical keebs, my iMac is using a wireless Magic Keyboard 2, and, when it's hooked up, my Bemani PC is using some old Microsoft keyboard that someone gave me.
Take my opinion with a grain of salt because of the other keyboard I used (still works to this day, so can't knock it for reliability), but build wise it feels solid. Doesn't have any flex when I grab it and twist it, good weight, overall "feels" quality to me, having this singular keyboard being my only experience with a mech.
Ah yeah. If there isn't any flexing/creaking then you're in good shape. Sounds like they probably used solid internals and just surrounded it with a plastic case in order to bring the price down a few pegs.
The main reason it's important is because if a keyboard can freely flex, so can the PCB. If it goes through too much of that, bye-bye solder traces.