Yes, well summarized @MrT10001. Though I'll note that not all of North America has lost 3G support. Here in Canada (at least while we remain a sovereign nation) 3G is alive on all carriers for now. Sunset dates range between July 2025 and Dec 2026. My impression is that a bunch of nations in the south of NA still have 2G and/or 3G as well.
If it were me though, I'd either go with one of the pricier but clearly supported devices you listed, or try to hold out a bit longer before buying something, to make sure it works well in 24.04 (and that VoLTE starts working, if you'll need it soon).
My guess is that the coming weeks/months might make it all a bit more clear which devices will have a good future with Noble and VoLTE.