I really wouldn't use their chiefs defense as an example here lol. They got carved to pieces for being agressive. You're arguing against your own logic here. You complain about soft coverage giving up chunks of yards and then you compliment the chiefs defense that gave up explosive plays all night long.
But I'm glad to hear you say that you can win with different coverages because, as I (and your friend Jim lol) have said before ... :
1. Your personnel matters. The Rams need better personnel (evidenced by the "ultra soft coverage" winning us a Superbowl just two years ago).
2. Pass rush matters. Jalen hurts was basically unbothered by the defensive line most of the game and that's why the secondary got lit up. A problem we also faced.