Pretty much every other country besides the US puts 250 hour pilots in the right seat of a 737 or 320, The 1500 rule greatly benefits pilots but the safety aspect of it is questionable at best. I did get a lot of good experience building my 1500, but there were definitely diminishing returns after about 750 hours. The only reason the US can sustain the 1500 hour rule for now is that we have a much more robust GA sector compared to everywhere else as well. However, that will shrink as well with how crazy GA costs are becoming.