You’d have to take your PS5 with you to use it on trips, so what would be the point? You’d still have to hook up your PS5 and have that running to use it.
This isn't true. You can remote play from an outside network that is different from the one your PS5 is connected to provided that your PS5 is in rest mode and your connection at both ends is sufficient.
That doesn't change the fact that it is possible. Also some people have vacation homes, or use airbnbs that have better wifi speeds, or will be willing to pay for faster hotel speeds. It's totally possible, but yes, your point stands that connection speeds matter and I would lower expectations if you are traveling.
Hopefully we get some deeper in depth reviews out there in the coming weeks. A lot of these reviewers only had the weekend and rushed these out. SpawnPoiint, which actually had a good review, admitted that during his review period he never even ran down the battery once. And according to Tested's review it only has a 4-5.5 hour battery life. The Verge article is also not the best review compared to some reviews like Tested, who tested this on multiple different connection speeds. Having read/watched most of these reviews, the Verge one seems to be the lowest effort.