You're right, it's definitely better than 4G, my wording was unclear, more in the sense of "Would I make this my home ISP?" than "how did 5G go?" (I would have thought cell providers would have 20-30% of the market now, ah, the follys of youth...)
TBH I think a lot of it is many people still don't understand the product or misunderstand their actual needs/usage. Plenty of "normie" households can easily meet all their needs with a decent 5G fixed wireless install. As we see more cord cutting we'll probably see continued growth in fixed wireless.
FWIW, most other ISP types are treading water in terms of overall subscribers while the only real growth overall in new subscribers is fixed wireless. Your gut probably wasn't wrong that fixed wireless will probably grab 20-30%+, but just timescale-wise off a bit.
5G home internet is the preferred in Australia where fibre isn’t present.
Even at my house where I have FTTH, my mobile 5G connection is persistently faster and quicker, that is both bandwidth and latency are superior on my phone from my home location.
Of course, the pricing is structured so you’re better off paying for both, either fixed internet plus mobile phone plane, or fixed 5G and mobile phone plan, depending on what is available at any specific location, but typically not all three options.
I'm guessing this is a US thing? In Europe, 5G is definitely faster while latency is on par with 4G. YMMMV between EU countries though.