Total number of nerfs isn't as relevant as the effectiveness of them. I think the point you've indirectly made here is that the nerfs haven't been good enough and some responbility here lies on the balance team.
I've seen champs get f**king nuked when Riot wants the champ out of pro play. It's clear with the repeated love taps to both Udyr and Hec that Riot was at least complicit with or enjoyed having then around and didn't want to blast them out of pro play (or blast their soloq win rates).
No jungle meta has ever been amazing tbh, but this Udyr Hec meta needs a stronger hand from the balance team to force it out, and it's not like it isn't clear why they're so good, as you can see from the comments in this thread.
To be clear, there are two distinct things going on:
An Udyr nerf, with a follow up that seems to be giving a real decline to Udyr pick/banrate, to the point where I expect with no further changes, he'd be sub-80, which tends to be the cutoff point. Still, he had another small nerf in 11.7. The round 2 nerf probably could have come in sooner, though.
And Hecarim, who did not cross pro play thresholds until the 11.6 nerf, which was a pretty substantial 0-20 damage off of Q. That is generally not what you'd consider a love tap on a low cooldown primary damage ability.