Well, there is a long list of them.
I came just before hf16.
It wasn't long after that that stinc set rewards to linear and went on a two year development walkabout, so that their bidbot friends could reap us, then 'they', many of whom are still here and 'in good standing' with the community, sold an undercover poor tax that took more the less you had and topped out at 50%, you'd have to look through the various forks to get more specific details, but there is a long history of self serving changes to the code.
Often just sprung on us with no real notice, nor discussion.

That said, what we have now is nearly friction free, it is much better than what we had when I got here.

Ideally, we would figure out a way to get back to the original design, but unless we could lock down the bots that's not gonna happen.
I think there are few enough of us that we, with a little teamwork, could put the kibosh on the socks and bots, but that isn't a widely held sentiment.

When I first got here, there was a 24hr payout and a 30 day payout.

The order in which you voted on a post was important, you could double or more your curation reward by picking content that was later voted by others.
The more others, the more your reward was multiplied.

All changed because the greedy wouldn't stop, and the more fairly minded didn't have what it would take to force the issue.
Greedy folks gonna greed.™

We forked to put an end to bidbots, then we let them come back but only if people sold their votes wholesale, ie, delegating for profit, or added a second layer token to obfuscate the nature of what was really happening, vote selling.

If I had been a bidbot owner, I would have been bent out of shape over that.
It makes me wonder what the trade off was.

I've posted about much of this, if you care to scroll back that far.