I love Driveclub but it's not a better game than GT. Racing in Driveclub is awesome, and setting better times is great too. Dirty racing against AI is what DC does better. The AI in GT is Canadian, trying to avoid you, practically apologizing to you when you hit them.
Doing clean competition races in DC on or offline is practically impossible. Racing close together, passing at the opportune moment without touching is the thrill that GT can give you. GT has the emphasis on driving clean in a wide variety of cars and provides countless events and tests for that experience.
As far as sound goes, I find that the weakest point of DC. Surround effects are well used, but during gameplay there is no bass at all. My subwoofer keeps switching off after 10 minutes of lapping, indicating there's no sound below 80hz, then turns back on for the menu music. GT lets you choose your setup and sounds mighty at full dynamic range. The sound options in TLoU remastered are the best. That lets you match the position of your surround speakers in the options. Would be cool if that was a system wide setup option.
Anyway should GT7 adopt aggressive AI? Dunno, it wouldn't feel like GT anymore. What it does need is to have the AI match your car performance. Only a few races in GT are really competitive where the cars are limited by the event. All the other ones you can easily have an overpowered car and leave them all in the dust by the second corner. It became more a game of how many I could lap before the race was over. It's more an overtaking simulator than a racing simulator.