Arching your back on bench press can actually protect your shoulders by putting them in a stronger spot. Many lifters still use it to handle heavy weight safely. @thomasr61 being extra careful is okay, but that old form wasn't just about being a scared cat.
Yeah that shift to what "feels much safer" is everywhere now. You see it with car seats having a million more clips than when we were kids. It's like a whole generation decided to actually read the manual.