This entire thread starts with an interesting premise, with no data to back it up : "...majority of Tesla owners can't access WIFI in their garage".
Stepping back, the
majority of people do no such thing with their phone, and would likely have even less interest in doing so with their vehicle. Personally, I have zero trust in the integrity of a rooted + sideloaded app phone, no sane person would do this to their vehicle IMNSHO.