I get the other concerns, but I'm not clear on why superchargers are one. If you have a PHEV, don't you have some means of charging at home? All you need is a power outlet.
The problem with the Tesla supercharger is that in order to charge the batteries in the shortest time possible they run them very close to the heat limit of the battery. Since a battery pack for a car has many cells the manufacturing tolerances mean some cells may be damaged.
An old colleague of mine went to work for Tesla in a senior role. When I asked him about the strengths and weaknesses of the car he didn't mention the battery life. When I asked him about super charging he just said, "you would bloody ask about that".
He no longer works there but has stayed in the US.
Charging at home is no problem, apart from how long it takes. We have a 2005 Prius, which is simply hybrid, and the traction batteries are still fine btw, don't know how common this is though.
I like the BMW i3 a lot, but its range means I don't want one and adding the range extender adds 200kg and kills performance so is a bad option IMO but recommended in car magazines since few of them realise that low weight is important.