I’ve got 2×9 on both my proper bikes and it’s fantastic… You lose only the top 2 or 3 gears which you very rarely get much use out of, and you get back a load of ground clearance and (depending on how you do it) possibly weight loss. I’ve almost never missed those highest ratios and even then only on the road or on really simple descents. Frankly losing out a bit there isn’t a major concern to me.
Also 1×9 on the rigid and it’s pretty nice. Wouldn’t want it for long weekends and I do miss the higher and lower gears (I can’t get away with 36T on the 1×9, it’s just slightly too much for me over distance) but it works well still and it’s a nice variety. Being forced into pushing the higher gears is good for the legs.
Obviously fitness plays a big part, some people say “Who need 22T”? Well, lots of us. Or at least lots of us need a lower gear than you get from a 30-something middle sometimes. If I didn’t, I’d lose it but I wouldn’t have got through our week in france with a single ring, unless that single ring was very low in which case I’d have missed the high gears badly. Just don’t have the power or the endurance, I can pedal up most steep stuff on 32T but I can’t do long climbs like that. And I don’t think that’s unusual at all, I’m in decent shape but I’m not a cycling machine, most people aren’t.
Oh and 1×8 on the commuter and 3×7 on the pointless 90s steel mtb.