It's as simple as it is.
ACC:
Only modern GT classes and no Nordschleife.
i'm Simple Not interested in 2020/21 AMG/Audi/Ferrari/Lamborghini at Imola.
What I like are Series like the NLS multiclass endurance over long distance on not so perfect tracks. Currently only possible in other Sims and Simcades.
Currently I prefer AMS2 over all other, Not perfect and also not quite a good variaty in fitting Cars for the NLS. Group H2 and TCR are missing the most. In general I like vintage Motorsports prior to year 2000 the most, since that was my active time.
Generally speaking, I think more Sims shoud feature the "Golden age of motorsports" which is neither now nor in the future but those 30 years ranging from 1971-2001 before the tracks got clustered with chicanes and the cars got neutered by regulations.