A relevant question to this thread:
I rent a house and will probably be there for ~3 more years before we build our dream house. My landlord gave me permission to have a circuit/outlet of my choice installed for charging. Our 200A panel is actually quite a long run from my desired location. It only makes sense to get a 6-50 outlet installed, right? And not spend the extra $ on an expensive run of 14-50-capable cabling, because I don't really care that much about future-proofing since I won't be there forever.
The cost difference between installing a 14-50 and 6-50 outlet is minimal. THHN 6AWG wire is less than 50 cents/foot. Me, personally, I'd spend the extra $25 (let's assume a 50 foot run) to install the 14-50 outlet, since then it can be used for welders, RVs, and plenty of other things, instead of a 6-50. I know you're not staying there forever, but it sounds like your landlord is pretty cool, so I'd do them a solid and put an outlet in that could be used for dang near anything in the future... It's only an extra couple bucks, so I'd rather do it right. But that's just me.