Syuks I think you are underestimate how massive the gap was.
With 2 ticks perf, for a route requiring 49/50 perfs, kohze with his 86% perf rate would be expected do it in ~ 200 attempts.
With 76%, you are expected to run it a whopping 54000 times before hitting it.
Now when we move to the 3 tick perfs, now kohze would easily do this in 2 attempts, which makes this route 100x easier. This might seem big until you realize moving from 76% to 93% means you will able to do the route in 8 attempts, still more than 98% of course but the difference in level of magnitude is massive, with the route being almost 7000x(!) easier.
Edit: I happen to recently calculate how likely for me to get 37 kzt perfs in 53 jumps in apricity bonus. With my 43% average perf rate, I only have 7% of getting that level of luck after 1000 attempts. If you have 45% average perf rate, suddenly the chances of getting that luck go from 7% to 20%, almost 2.5x more likely to get WR, which is bonkers to me.
oll9abc Sure this lowers the "skill ceiling", but this isn't a good ceiling anyway, because scrolling is unreliable by itself as well.
There are two problems in scrolling to bhop: scroll timing and scroll speed.
You scroll right before you land to jump as soon as possible, and you need a decent scroll timing to know when to start scrolling. But in the air, you can only do a "jump" every 2 ticks. If you happen to attempt to jump one tick before you land, it is impossible to perf when you land on the next tick. It's humanly impossible to dodge this if you scrolls.
This is the idea behind 2 tick perfs, as this guarantees you a perf in a scenario where you attempt to jump every tick, to makes scroll timing not random. But the perf rate is still not 50%, because....
... you don't usually do a jump input every 0.007 second.
Even when I try to scroll as fast as possible, I still have gaps everywhere in my scroll. If you have unlucky scroll timing, you will effectively only have 1 tick of jump window. That's where 15% of 3 ticks jumps come from.
Is scrolling as fast as possible with a mouse as many scroll step as possible a good skill ceiling to have? I don't think so, especially when there's so many other aspects to improve as well.