I don’t believe you got 380000 miles on the original trans.
Well, you can believe whatever you want. I am on my third new company vehicle I’ve ever owned in my life. I’ve driven them a combined total of more than 900,000 miles and I’ve never replaced or rebuilt an engine or transmission.
My ‘09 Subie Outback is closing in on 300k, and the previous owner did quite a bit of heavy (for an ‘09 Outback) towing with it. (I’ve only done moderate towing, and not a lot of it. The car was purchased @ just under 100k miles on it.) So far, it still has the all original power train. The transmission seems ok (except a little while back a hose clamp broke and the feed to the transmission cooler blew off. That got me a long afternoon pulled off at a little cemetery until my daughter could come get me & haul me back home for tools, a new clamp, and trans fluid.) (Subies take a unique fluid, so I keep some on hand.)
I do monitor the trans fluid (all fluids, actually) and change it out when it starts getting a little brown color in it. Plus wifey and I are not drivers who would stress a transmission badly.