These devices are already rather heavy.
I wish there were more options for people who don’t care that much about the camera in their smartphone. I remember the non-bump camera in the 7.6 mm thin 2016 iPhone SE was perfectly fine for many situations, I took some impressive vacation photos with it.
Just get a cheap phone? If you're paying $500+ for a phone, I'd estimate most of that money is going into the camera. Judging by the marketing, anyway.
Alternatively it's just exploiting "everyone uses a case" to get a mm or two of space for the camera lens that can very productively use it. Thickening the whole device only makes sense for people who don't use a case, which is basically no one (well, me, but most people love their cases).
Never used a case for any phone I've owned.
1: Using the wet moulding technique.
My reason is that I never sell phones anyway, after 2 years I get a new one and give the old one to a cousin or something like that.
1. https://www.etsy.com/uk/listing/1303285181/leather-google-pi...
You've got to specifically look for one that has raised corners or something to compensate.