Even if you want to argue that providers could offer 72Mbps-144Mbps, unless there is a change with how much "prebuffering" there is, have ideal network conditions always, and change hardware on most consumer streaming media devices -- we're still losing that quality.
Most streaming providers are betting folks prefer convenience over quality and that folks don't have ideal setups to tell the difference. That they aren't even getting the right size 4k TV to tell a difference (https://www.rtings.com/tv/reviews/by-size/size-to-distance-r...).
The part that frustrates me the most is that it feels streaming services are trying to redefine this as the "peak experience," and try to upsell (Examples: Netflix 4k plan or IMAX Enhanced on Disney+ https://help.disneyplus.com/article/disneyplus-imax-enhanced)