PMTiles is great for a static background. You can easily do a layer on top with geojson like you say, or even just by storing your own data in postgres and using postgis ST_AsMVT to turn it into a vector tile layer. Stick a cachebuster in the URL & a http cache in front and you can call it a day.
> Proper support on all platforms. No point working on PWAs that have janky tooling (reason: see previous sentence) when they're only going to work decently on Android devices anyway.
If you need it spelled out for you:
* WebUSB
* WebBLE
* WebSerial
* WebGL
* Many more standards Apple refuses to implement because it would let developers break free of their walled garden
Without being able to target apple devices why would I, or anyone, bother using these technologies and invest in their tooling? Just make a native android app with quality tooling that's been around for a decade and be done with it.