At the moment, such a feature is of no use to me. As it stands, I get well over 500Mbps on my home Wifi. I never have problems with latency or disconnects etc. Maybe one day I will have use for the feature.
The main use case I'm thinking of is ultra-fast NAS backups or simple storage.
MBP 13" pricing to move from 512gb -> 2tb is $540.
Now, imagine instead, you buy a NAS for $250ish and can connect directly (or indirectly) over wi-fi 6E.
$250 nas + 8tb HDD ($200) = $450
WD Red 5400rpm can write at ~ 180Mbyte/sec, or 1440Mbps. 802.11ac can't hit this speed in the real world, but wi-fi 6E potentially could.
Not the best for everyday stuff / when leaving home, but great for backups and large media storage that you don't need to keep on your laptop. Main issue here is the NAS will have to have > 1Gbps ethernet interface.