I ride about 5 PSI in my original Snowshoes on 80mm rims and love it. I weigh about 175. Drop down to about 3 PSI in the snow.
However, to the matters at hand.
I see too many standards as a wrench where I live, but for different reasons. We as a shop and a market are not big enough to stock everything, or even know/experience everything. We end up learning new stuff as it comes in and we can actually get our hands on it. Then, after researching it, we have to order parts, which can even be frustrating as our suppliers have sometimes even not known all about it! Enough people want new stuff to buy, so we bring the bikes in, but not enough people buy them that we stock spares and stay fresh in working on them. A bit of a dilemma. Also, it's hit or miss as to who has what, where you travel to. Maybe in the US it's less of an issue with bigger and more dense population, but in Canada's Maritime provinces, I find it's like owning a weird/rare vehicle. Best stock your own spares and know how to fix it!
I see a lot of people not maintaining anything hardly now, and just buying a whole new scoot. Really? Like, where does this money grow?!? Seriously, though, it's bad enough no one really rebuilds suspension here yearly, even though it's super wet and abrasive here. It's to the point they don't even like to monitor chain wear and just get a bike when the drivetrain is all toothed up! But, the bikes aren't $500 jobbies. I see XT/XTR/XO/X9?X-11-whatever equipped bikes treated like poo, and tossed aside when the next bike has had the head angle changed 0.5 degrees and it's such a better bike than the current one they have.
Even my fatbike is "obsolete", after a year. The manufacturer went from a 135 front hub to a 150 to accommodate Bluto wheels. Makes sense enough, but after being issued my third warranty frame, I have gone through two generations of frame in less than a year, changing my geometry and losing three headset spacers in the process. If I upgrade the fork, I get all the spacers back that my taller headtube ate up, but I'll need a new front wheel. The newest version went to a 197 rear hub, so if the frame kaputs, I'll also need a new rear wheel. Although I think the tighter rear end and beefed stays will be much more reliable. So, yes, the bike is better and better, but it's not like a modular upgrade, easily or inexpensively. Before this, a few bikes back, I was riding a rigid chromoly bike with cantis and 7 speed, then upgraded to 3x10 speed SLX, built some nice DT Swiss hoops up around XTR hub, etc, but the rim brakes were limiting me. And my non-suspension corrected threaded fork. I could have went carbon or something up front, upgraded my stem/bars, had disc mounts brazed on, or just got a newer bike. So, I got my 29er. A Giant XTC. Got a Talon 29er for the missus, as well. Now Giant has gone almost exclusively 27.5". Is it better? They actually seem to think so after extensive research. Maybe it is. But I remember monster trucking over everything on a hardtail. Set it up tubeless with fat rubber, and wondered how much better a true fatbike would be. So, out with the 29er, and in with the fatty. Could have kept the steely running, the 29er, or various other bikes, but they usually were upgraded before they were ever actually obsolete. Now, that said, I'm not for high end bikes that eat pivots, suspension seals, and other proprietary parts that might not be supported for long. But, a nice simple bike with "common" standards, and you can keep them going for ages, if you like. My 44mm headtube can literally accept just about anything. Threaded BB should be good for a while yet. My 190/135 hubs? Well, a fork away from a newer wheelset someday, possibly a frame, to get the "next" fat standard, but that might never actually be a worry. Cartridge bearings at both ends mean I am not scrapping hubs just because they weren't serviced in time.
Too many standards, but only the good survive. Which means there must be a fair bit of good stuff out there! As long as any crank, fork, derailleurs, wheels and post can go on, you can keep rolling.