Not trying to argue against your point, but most of the Bluetooth latency comes from the codec, not from it being wireless. Bluetooth LE Audio comes with LC3 which supports a codec latency of as little as 2.5 ms.
XTEink isn't using ESP32-S3 but C3. That S3 dev board from OP also comes with 8MB PSRAM (xteink/C3: 384kB RAM only) which IIUC makes quite the difference when it comes to building an embedded OS.
Dex and Android desktop mode are not a single new thing, but multiple features that partially have been in Android for years, like external screens, resizable windows and the (currently rather limited) external screen drawer.
Worth noting that web fonts are often split up across multiple files for sets of codepoints and font weights/styles, so depending on the language you're writing in a single WOFF file might be missing a few letters.
That's fair but not universal. Plenty of communities exist around playing board games online and often that's the only way to meet players of equal strength or run large tournaments.
For me Tectonic[1] solved many of the issues I had with LaTeX, so that's what I'd recommend if you still depend on LaTeX as a language. Make sure to use the V2 CLI (`tectonic -X`) which comes with convenient features like watch mode. With vim and evince (or any PDF viewer that auto refreshes) open I get a similar real-time experience to popular online editors like Overleaf, but in the comfort of my own editor.