I don't think you know what you are talking about. Granted, there is no torque modelling, no camber modelling and no suspension geometry modelling in Gp4. But no turn in understeer? Are you nuts?!? That would mean that you would never need to brake at all for any corner whatsoever!!!
Turn in understeer means that your front tyres do not have enough grip to turn in and hold the line as you want to. If you ever find yourself running off the track before the corner is finished, and there are no other explanations like you got hit, spin, or lack of concentration, you just experience MASSIVE turn in understeer. Ever run wide in a corner? Thats turn in understeer. So, try and go to Hockenheim and take the Jim Clark Schikane flat out. If you do it, then I will believe you.
And braking at 50 meter mark? Same as before, show me a hotlap thank you very much.
Eau Rouge with no nosecone and no aids flat out in the rain on slicks?!? Show me a hotlap.
Don't believe everything you read. Think and maybe even try to do it yourself. Better yet, have proof when you post about it.
It's only after we've lost everything, that we are free to do anything.