If your mental capacity is reached by checking your surroundings while all the traffic is going roughly the same speed as you, then no way youre capable of handling "no speed limit" where everyone is driving to their liking.

It's not just you who'd be suddenly free to do whatever they want, but everyone else too.

Claiming "I know better what's best for me" is the best sign of someone who absolutely doesn't.

I think traffic calming is really interesting for this reason, building roads to make you feel most comfortable at the correct speed. The road design here is usually good, but when driving I feel really anxious on roads that have a design not matching the speed limit too.

100% agreed. If I don’t set cruise control, I usually speed on my commute due to me just focusing on the grip of my car, distance to/from other cars, and perceived speed. It’s just hard to gauge speed without checking often on my speedometer, which isn’t as safe. Even just trying to follow at a constant distance in the right lane is difficult because the semi trucks usually end up having wide speed differences at random times, meaning 60mph-80mph depending on the hill usually.

This can be solved quite easily by introducing head-up-displays in cars showing the speed in front of the driver. HUDs were introduced years ago in some airliners allowing the pilots to maintain situational awareness while having quick access to the critical information about the aircraft. And introducing safety standards from commercial aviation is almost always a good step.