They will never do, because they are not trying to. AFAIK no one is trying to build FOSS reviews of restaurants/stores, no one is building street view and no one is saving where you live to make the one click from work to home route planning. For me, those are not functions that I need (or want). I need a map that works offline, does route planning (offline) and allows me to display multiple GPX files at the same time.
Does OSMAnd have all that? It does, so for me it’s an alternative. What use case do you have?
AFAIK someone is working on it. But the problem is the high dynamics of public transport. Routes and schedules get changed quite often, schedules might be quite irregular (think only Sunday at 3:14). And all that data has to be stored offline. Stops might be changed do to construction work for a week. And that is in the optimal case: In some countries the bus comes when it comes, and stops if it wants to stop.
Currently you can see where the lines of a bus or the metro go, but that’s about it, I think.