Oh really, I didn't even realize it was originally 50/50. I hit 3 years here the other day and as far as I'm aware it's always been 75/25 during that time. I could be wrong about that as I'm just going off of memory.
I do think HF21 is a step in the right direction towards rebalancing those incentives. I'll be paying close attention to see the effects. I like the idea of incentivizing that altruistic behavior and I might even prefer that to instilling it as a culture, but I'm open to both routes to moving away from vote selling completely.
The change from 50/50 was made in mid 2016 so it is quite possible you weren't around for it.