- Most screen readers handle DOM updates just fine.

You sure about that? Because last I checked (and as I indicated in the linked comment), that's not actually true (at least not without some serious consideration from the app developer's side of things).

The rest of your comment, pleasantly-surprisingly, is good to hear (though I'm concerned that lower-end devices aren't getting enough attention; I know firsthand (from witnessing it with my coworkers and even with myself) how easy it is to assume that everyone has wonderful hardware and accidentally create something that readily bogs down hardware with even the slightest amount of age), and I do wish you the best of luck with this.