Some tire dynamics.

Bias ply tires have a stiff sidewall and soft tread. This is why they don't look flat and the unloaded tread has a pretty hefty crown. The tread is constantly scrubbing the pavement causing accelerated wear and grip issues.

Radial tires have a soft sidewall and stiff tread. This is why they look flat and have a nearly flat tread. The tread is mostly just rolling along and the sidewalls are flexing but not rubbing against anything.

We need flex in the system somewhere because otherwise we would have a very thin line of contact with the road ( steel wheel on a hard surface. )

If we have soft tread and sidewall, we end up with a drag race tire than winds up the sidewall to give more mechanical gear reduction due to the radius shrinking and a tire grows at speed giving an overdrive of sorts.