With 5G in particular I think it's important that people talk about which specific technologies they're referring to.

In the US at least, low-band or extended range 5G is widely available and has been for some time (and I'm talking about the "real" 5G low-band, not the BS marketing speak AT&T used for a while). Mid and high band 5G, or 5G ultra capacity, is much less available but if course it only really makes sense in dense cities.

I'm surprised that low band 5G isn't widely available in most 1st world countries, as again it's been here in the US for many years now.