I dance since it hasn't blown up.
I also go by this schedule:
https://www.shopdap.com/blog/post/service-schedule-for-mk7-gti-2015-2016.html
I would do the brake flush like you suggested and also spark plugs.
Official VW service manual does actually recommend 40k flushes on both the DSG and slush.
Brake flush (if 2 years have past), oil and filter, air filter, cabin filter, MT oil, Haldex (if Perf Pack), new wipers, lube sunroof and door hinges, tire rotate, spark plugs, check brake pads/rotors for wear and boots for rips/tears, check for leaks, top up all fluids, blinker fluid and muffler bearings.
GTI, with or without performance pack, does not have a Haldex unit. Thats on an R
LSD?