You can actually enable JIT for a specific app for yourself. Nintendo emulators actually can make use of that, for several years now.
Itβs just a niche, so no one bothered porting a whole ass browser with its JIT compiler and GC and whatnot to ios for that 3 users. Now it can change.
No, these emulators achieve JIT via a method intended for remotely debugging apps. AltStore has a way of automating this, but it requires an active server connection when the app is launched.
In AltStore's case, this means you need to be on the same wifi network as the computer running AltServer. I don't know whether it would be theoretically possible to do this over WAN, but it definitely isn't practical at a large scale.
Itβs just a niche, so no one bothered porting a whole ass browser with its JIT compiler and GC and whatnot to ios for that 3 users. Now it can change.