I don't know whether the newer electrically-releasing battery adhesives would count, but they do allow cleanly removing and replacing the battery without proprietary tools.
They’re not proprietary but some of them are expensive and somewhat specialized. I don’t think it’ll be really economical for most normal people to self-service many repairs, but it’ll be very viable to have a corner hardware store that can do it for you for cheap. Self-servicing battery replacements ought to be doable with an eyeglass screwdriver though.
