I am pretty ignorant about this, so don't laugh!
10 years ago I had a trailered boat and had Uhaul install a hitch for it. It was some non-standard size and no accessories (cargo platforms, bicycle carriers, etc) were available for it. Also, the way they attached the wiring cause a short. I ended up suing them and winning.
So, I am thinking about getting my 2019 Outback with a trailer hitch.
1) is the wiring done better than uhaul's so I won't have problems with it?
2) I "know" it is a class 1, which is a standard, but very light duty. Is stuff commonly available for it?
I won't ever be towing more than 1000 pounds, and then only for short distances.
Not sure what you had back then, but there are 2 standard sizes of receiver hitches.
The 1.25" and the 2". The OEM is 1.25".
There are lots of accessories for both sizes, but more for the 2". Many times the 1.25" accessories will come with a 2" adapter. The OB limits your towing capacity, not the hitch rating (unless the hitch is rated lower than the OB).
Wiring is already, mostly, provided in the OB. You will need to get a wiring module. One end plugs into the OB wiring harness that is already built into the car. The other end of the module is the trailer plug itself. There is no need to cut into and splice any wires, that's probably what caused your original problems. It's about a 5-10 minute very simple DIY.
edit: If you order with the OEM hitch, they will simply plug the wiring module in for you when they install the hitch. Plus, you get the new car 3/36 warranty on the install and parts. If you DIY, the wiring is very simple.