I hear you--you're not wrong! I even agree with some of your points.
I used to pay for the bundle packs and the legendary return rate was so much better. It's mostly anecdotal at the moment because I have only one "F2P" expansion of experience.
It was mostly just a #feelsbadman post but going 67 packs with 1 legendary is really terrible--that's an awful rate. I'm pretty much done with buying Barrens and having only gotten 3 legendaries plus the 2 from the rewards track sucks because there are quite a few decks I'd really like to play but can't without doubling down but I'm saving for the next expansion at this point. Even the alleged 1/5 packs for epics is soooo far from what I experienced.