What exactly does this refer to?
My Eat Wrong Tea can be charged from either side, but only the passenger side supports the fastest charging.
Is this 14-50 the type of plug that runs from a high speed charger and attaches to the passenger side, and the other a slower-charging connector type that works in either port?
Sorry for the dumb questions. I normally have even less interest than aptitude for these things, and I’m almost(?) completely inept.
Voice to text mistranslation? 
The one on the left is a 14-50 (Tesla examples).
As for fast charging, that will be CCS1 (your left side), versus J1772 for “normal” or level 2 charging.
CCS1 have big heavy handles… can’t mistake it
The plug side of the evse that plugs into your wall outlet. Youre currently using the 5-15p that is a normal 110v, 15 amp capable plug. Some thing most of your electronics in your home use. This will allow your level 1 charging.
If you swap the plug out for the other one in the kit, youll put a nema 14-50 plug on. This allows you to plug in to a 240v 50 amp capablr plug for level 2 chsrging. Itll charge about 8 times faster
He’s been making fun of the e-tron(r) brand since it launched.
Now he’s leasing one 
That’s the new outlet you need installed
It’s just my running fascination with a terrible product name that no one can spell, capitalize or punctuate correctly.
Browse the forum and you’ll see eTron, e-Tron, ETron, E-Tron, ETRON, etc.
I didn’t realize that Audi couldn’t spell it either until they started messaging about the one I just got.
First time I’ve seen this variation, so I’m calling mine an Eat Wrong Tea.
It’s also awkward that Your myAudi Team hopes I enjoy my myAudi app.
That makes sense, thank you. I was basically thinking of the wrong end of the cable.
That also adds some context to what the salesperson told me, although I’ll need some help there too.
She mentioned that I could essentially delay obsolescence of the wall plug by putting in the next level up(?) from 14-50, which would also be backward-compatible to what I need for L2 charging for this car today.
Does that make any sense? What would that be?
Ignore whatever she said. Install a 14-50 outlet with at least 50 amp. Simple. Done.
Unless you enjoy driving around looking for that one working EA charger.
I’m putting something in either way.
If overshooting the basic requirements is trivial, it might be worth it. I just don’t know what the next step up to assess might be.
I would have the electrician install adequate wiring to support a 60 to 80 amp load, then install a 50 amp breaker and a nema 14-50 outlet. In the future, if you want to move to a higher amp evse, you can just swap the breaker out for a 80 amp and hardwire in a higher rated evse.
This is essentially what she was telling me, now that I understand the rest a bit more and see your explanation. Thank you.
(I thought I remembered a “60” and an “80” in there somewhere 
).
You can go up to 100 if you’re feeling frisky. The main idea is that running the wires is the expensive part, so be sure to give yourself lots of headroom.
That’s what we did with our HPWC, wired for up to 80A continuous on a 100A breaker.
There will be some additional and non-trivial dollar out of your pocket, and I’m not really sure what for? Possibly a future EV that charges faster at home? Does home charging need to be faster? What’s the difference between 2.5 hours overnight vs 5 hours overnight?
One night stand vs. a marriage.
You spend 2.5hr on the wife?
wifes* man of many
Not my jam but respect the hustle.
