It is a good salary but you need to appreciate that in many of the world's megacities - NYC, SF, LDN, SG 100k USD won't even get you a particularly good apartment to rent.
So it's all relative really. Tho yes, it's a fun thought experiment to earn 100k USD while living somewhere in rural Asia where 10$ a day lets you live super well.
100k USD (for one person, non family), depending on your taxes, can get you a reasonable apartment in NYC, perhaps even a fancy place in Brooklyn (and if you're lucky, a good place in Tribeca or the Meatpackers District).
It can get you a pretty mediocre apartment in Central London but who lives there? You'll easily get a comfortable place in Zone 5 or outside for cheaper too, with a better QoL. Parking costs might have to be factored in though.
Singapore, you can literally get an apartment next to MBS in 100k USD - if you like living in a weekend ghost town. If you like to live in a more lively place, I think apart from Sentosa (which is filled with tourists anyways), places like Bukit Timah and Tanjong Pagar are comfortably within your reach. Or you can stay in Jurong where all the expats are, for much cheaper.
The only exception here is San Francisco, where 3k USD pm will get you a cardboard box inside someone else's bedroom, or possibly even bathroom. That's the Bay Area's fault for really shit planning (which, I was surprised, managed to beat London's planning by a mile - in shittiness).
It's amusing for me that you instantly disqualified the idea of living within Central London. It definitely depends on stage of life but being able to walk to work or walk home late at night in Summer is a seriously underrated QoL feature IMO. Tho ofc you don't get outdoor space.
I lived in Central London right until last year. Definitely depends on stage of life, but it's not like London is unlivable for someone making 100k pa.
Also if I wanted to walk to and from work, now I'd rather get a hotel or ABNB and commute like that for a while. It seriously gets old.
Sure it's not unliveable but the original parent was making out like 100k would let you be rich - my point was in the megacities you're not even close.
Also fwiw I've lived 4 years of my life inside zone 1. I think the main downside is air pollution and outdoor space, although you can find garden flats dotted around
