I’m not intending to be rude, just stating that through numerous extensions, version reviews, I’ve not had an issue that has been due to a build process since the initial inception of Extensions on Twitch. Additionally out of all of the Extension developers that have come through the forums, the TwitchDev Discord, there have been many times where Extension review is delayed but I’ve not seen anyone else but you reporting a fault with a build process during review that is the cause of a delay.
If you want to submit a feature request, awesome, go to the appropriate place for that which is UserVoice. If you think this is a widespread issue beyond just yourself then lets see as such in the feature request feedback from other developers. Perhaps this is some sort of widespread issue that people just haven’t been reporting, who knows until you make the UserVoice post and see.