We find that many older parks, state parks, and all moochdocking is on 120V supply. Of course there are plenty of places to stay with 240V, but casually estimating, I would guess >30% of all parks are not upgraded. Many of those are decrepit and undesirable places to stay, but of course some of them are otherwise true gems.
Having to reprogram to break the split phase config is a huge bummer. It means a total power drop, which is a no-go in our rig with the computers and other machines that maintain state.
This is a little random but in reviewing my thread I saw this and I've since learned that I can connect to single or split phase without reprogramming or power loss or anything special (e.g. works with standard RV dog bone adapters). I'm not sure if I mentioned that elsewhere in my thread. I can leave the Victron's set to NOT switch as group, and it works no matter what I connect it to. I've yet to find a downside of having "switch as group" turned off.