It's only reckless if you go full force right away. Test the waters with a light load to get the blood flow going, then increase weight as you feel the area is healing/getting stronger. Stop adding load or deload when it starts to hurt.

I know a lot of physiotherapists/physical therapists. They all talk about excessive rest causing more issues than not enough rest.

It’s potentially reckless to rest excessively, it just doesn’t feel that way.

Sure, but there are already many many people partially or fully disabled by over resting after an injury. The parent comment was hardly calling for running marathons right after a car accident.