IP did not felt good and it took forever
So a lot of players have been spreading the idea that IP "felt" good and it was easy to get, this is getting quite obnoxious and it's honestly ridiculous. In average we use to make 100IP per match(it was really less but with Win of the Day I think it's fair to average it to 100) that meant you needed to play 63 matches to buy one of the newer matches, 63 matches, that's an insane amount of time in-game and it also took most players a week or more to archive. So IP NEVER felt good and it was a gigantic slog, now enter BE and leveling, does it feel good? No, it's still a giant slug but is it faster? Well lets find out.
It takes about 5 games per day to level up, this includes Win of the Day of course, otherwise it'd take about 10 games to level up. Assuming you are super lucky and get the shard you need and only 6300 shards it'll take you 4 levels to purchase a 6300, so best case scenario it's 5 games a day for 4 days so 20 games, worst case scenario it's 8 levels of 810 each so 8 days of 5 games per day so 40 games.
"But what if I play more games on a single day! I wanna play more than 5 games per day!!" The only way even under the worst case scenario that you'd make less IP it's if you're playing 30 games per day, 30, every day, unless you're a pro and it's your job it's not gonna happen.(If you play 30 games per day you'd get 6000 IP in two days or about 7 levels in two days, if you're super unlucky and get only 810 drops you would make less BE in this scenario)
My point is a) IP sucked it took FOREVER to get any significant amount and you'd also have to spend your precious points on dumb stuff such as runes and b) BE is mathematically superior you can complain all you want about "feeling bad" but that's a mute point when the previews system felt bad anyways.
Stop romanticizing crappy systems nobody liked and were bad for consumers.
(I been playing since Season 4 but only seriously since Season 6, I own 77 Champion never paid RP for a single one)