I'm not sure it's very wise to use 1960s F1 cars on hard as rocks pre-radial tyres and zero downforce (running in an engine with its own shortcomings) as our benchmark for how anything else ought to behave. If they made modern road cars drive like that I'd be more worried 
Certainly you don't have to look very hard to find a lot of criticism thrown at GTR/GTR2 that aero was given too much importance, ordinary mechanical grip was of too little importance, and the tyres had too sharp a drop off past peak slip. Arnao even said they'd overdone loss in GTR2 himself. So now they've taken those criticisms onboard, put in a new tyre and surface system that tries to get around some of the old limitations. To an extent it looks like people have confused things that were bugs, and were acknowledged at the time by the developers themselves (both by Kraemmer in GPL, which Arnao also worked on, and in GTR1/GTR2) as bugs or limitations, with the parts that were realistic.
I don't think the friction coefficients being too high is really the issue, these are open to play with in terrainpool.xml and physicstweaker.xml, lowering them actually increases sliding behaviour even further.
Certainly you don't have to look very hard to find a lot of criticism thrown at GTR/GTR2 that aero was given too much importance, ordinary mechanical grip was of too little importance, and the tyres had too sharp a drop off past peak slip. Arnao even said they'd overdone loss in GTR2 himself. So now they've taken those criticisms onboard, put in a new tyre and surface system that tries to get around some of the old limitations. To an extent it looks like people have confused things that were bugs, and were acknowledged at the time by the developers themselves (both by Kraemmer in GPL, which Arnao also worked on, and in GTR1/GTR2) as bugs or limitations, with the parts that were realistic.
I don't think the friction coefficients being too high is really the issue, these are open to play with in terrainpool.xml and physicstweaker.xml, lowering them actually increases sliding behaviour even further.
