Carriers are giving away phones for free with renewed contracts. You speak as if a MagSafe iPhone 17e is like an extravagant trip to Hawaii. Anyone that cost-conscious would be protecting their precious with a case anyway, and there are cases with MagSafe that are cheaper than paying someone American labor wages to crack open their phone with an unofficial modification… but you’re right, there is an edge case for hockey players on a budget who just got into a team fight.
American labor wages, hockey players, trip to hawaii...
Alright, not everybody here is american. And when I say "here", I mean "on this planet". There are contexts that are different from your own reality.
From third party resellers, it's a $25 component and a 20/30 minute job (which, I'll have you known, isn't paid American labour wages outside of the US). And taking the rear glass off is something that, again, you may need to do anyway. In fact, it may be upsold even with a battery swap, since it would add almost no labour.
Not to mention people who may do this themselves. It's no rocket science.
So I see many circumstances, surely not very common but not very rare either, that could make this replacement quite a nice idea.
Would I buy a case? Probably! Though, as I said somewhere else, there's less choice for mag-safe cases.
If I needed to replace my rear glass and could get the mag-safe one insted, would I pay just a little more? Why not?!
But my main point was that not everybody who buys a cheaper phone is automatically refusing to spend any money to upgrade it. And you appear to be unable to conceive that.