I didn't read it, this is an interaction they have specifically talked about before when doing various changes.
You go from an ad hoc argument to making a strawman, or else you seriously need to work on your reading comprehension. I mentioned ways that knockup CCs are applied as I literally said, but you apparently mis-read, "already happen in some instances." I wasn't complaining, as you claim at all, about anything. I was mentioning various ways it can play out based on certain properties. Malphite's Unstoppable Force, for example, is a dash, yet it is uninterruptible, so knocks that hit him mid dash will damage him but the CC is ignored. This is the one example of the second way I described this interaction working. Vi's Assault and Battery however, has her buffer CC during the animation, but she is affected by the remainder of the CC once it's over. This is an example of the first way I said this interaction can work.
In other instances, yes, the knock up will interrupt the dash. That is not, however, the only way it works. Once again, it also has fuck all to do with the laws of physics, which you already misrepresented in your original comment that I replied to.
TL;DR learn some better reading skills, and know what you're talking about before trying to correct other people who are not wrong.
P.S. keep spamming them downvotes.