I can’t see the UOAs, though.
3 OAI uoa’s with one showing 4% and two showing “>5%” via GC.
OP at the very least I would be running an ACEA C3 5W-30 or an HDEO 5W-30 like Rotella T6 MV.
Also, the owner’s manual has hints about thicker oil with 5W-40 on the temp chart and language that a thicker oil is required in high temps.
As mentioned, the fuel doesn’t appear do be causing elevated uoa wear, although IMO that does necessarily mean that you’ll never have an issue. I would definitely give your dealer a copy and ask them to add it to your file.
If you dig up the 2015 WRX uoa thread in the Service & Maintenance forum on nasioc, there are quite a few 2.0DIT uoa’s there. IIRC, 2-5% fuel via GC isn’t out of the ordinary for short trips. Actually, the 2.0DIT forum at subaruforester.org has a sticky with a lot of high fuel uoa’s as well. Quite a few of those have lots of idling in winter for warm-ups.