Yes, a short list of recommended or popular extensions on iOS would be helpful. I don't think these need to be any more vetted or thoroughly tested than the "popular extensions" on macOS. Just ones that are reputable and generally known to work well.
I realize that there are hundreds of thousands of extensions and they change frequently, but the top <x> extensions is generally a pretty stable list consisting of the usual suspects.
Re: lack of telemetry, presumably this also applies to Orion on macOS? And yet there's a curated list of popular extensions in Orion for Mac.