To be fair, this isn’t really something new. The West has consistently lessened required penitential practices over the centuries of the Church’s two millenia (for better or worse). There’s a discussion on this progressive laxity and some proposed reasons for it here from Cardinal Lepicier’s treatise on indulgences (written in 1895):
Start on page 344 of the book (368 of the browser viewer), paragraph 7 and continue a couple pages:
Also, customarily, the East tends to set a high bar, but then is more flexible with it while the West tends to instead set a strict low bar which binds gravely. Each approach certainly has its merits.