Since you're asking, I am using my 49 as the example... Stock 230, except for intake/exhaust changes, stock front suspension with 1 coil cut and no shock relocation, disc brakes, late model rear axle with 3.0 R&P, 235/60/15 rears, stock 3spd FD.
You're right and wrong about improvements over time, 38-39 there were many improvements to the chassis, 39 to my 49 and later, not much changed.
I drove a 40 Ford PU for many years and miles up and down California at 65-70, all stock buggy sprung beam axle suspension. Stock 59AB, 3spd with OD and no issues except the occasional overheat in traffic. Point is, it can be done and done comfortability.
I was only asking if it's a personal choice or some cars were incapable and in need of repair?
Yes, if you wreck one of these cars it will probably kill you but I'll take the trade off and not worry about what could happen. I'm 49 years old and not 25 so I do take less risks but there are limits to what I'll give up... Gotta live a little to stay young.