Cup or non-cup, the brakes on the Meg IV RS feel spongy and weak compared to the old car - or rivals such as the Honda CTR, Focus RS, Scooby STI etc. Apparently some nuffies complained that the brakes on the old car were too grabby, resulting in confidence-sapping sogginess in the new model. Maybe bitey pads would help? Maybe not.
WRX has really lost its shine. On my i30N v WRX v GTI v Focus ST test for Drive, the WRX's open front diff would spin up an inside wheel on tight corners, causing TC to intervene and chop power altogether... effectively making the car no-wheel-drive instead of its much-vaunted "Symmetrical AWD". The Hyundai (or a GTI 40 Years / GTI Performance / MY19 GTI) will actively send power to the outside wheel, helping the car rotate AND drive out of the corner. A CTR or Meg III/Meg IV in sports mode will spin up the inside reasonably freely while pushing power across the diff. All of those are better options than the laggy, under-done, numb and generally underwhelming WRX.
The stop-start reset is a requirement of the car's type approval. Fuel use, CO2 emissions etc are calculated based on the car's most efficient mode - race mode with stop/start off would return much less attractive numbers! It's the same in all modern performance cars.
The brake squeal is interesting. I found the Meg's brakes to be pretty underwhelming on track at Norwell and Wakefield Park - really wouldn't call them "race spec". Many of us run much (MUCH) more aggressive pads than the OEM Brembos with minimal or no squealing. Have you given them the old "Italian tune-up" to get them properly hot and bedded in?