I thought glass phones were for wireless charging, which I’ve associated with difficult battery replacement, though maybe that is coincidence. I decided against some older Pixel phones because ifixit rated battery replacement as difficult. My old and new Android phones both have plastic backs. Old phone is fairly easy (undo a lot of tiny little screws, replace battery, replace screws). New one is more difficult (heat edge of phone and pry apart) but I think it is not as bad as some. Will see how it goes when the time comes.