It's the way things are going
It's a shame how fast this seems to be becoming the norm. I fixed many of my own phones over the years, up to my Nexus 5, which needed the screen and back replaced at different times due to drop damage. My current Pixel will be the first phone that I'd need to deal with heating up adhesive to get the screen off, and having had a bad experience doing that with my Lenovo ultrabook (it's amazing how fast thin plastic parts can melt under a standard heat gun, even on the lowest setting, if you're not paying attention), I'd be a bit scared of that process.
But the fact is that repairability is not likely to be a key consideration in most people's buying choices, since repairing the phone is something you probably hope never to have to do, and most people will probably upgrade before the battery dies, so it's going to come way down the list of considerations when choosing a phone. So with little incentive for manufacturers to worry about it much, I suspect they'll do whatever suits them best, and if that means potting the whole innards in resin and making it 100% non-repairable, that's what they'll do.