I think the traplaunch on Side-Stroller should NOT be banned.
First, unlike traplaunches in other games (MBU,.MBG, MBP), the traplaunch on Side-Stroller does NOT skip the entire level. In fact, it only speeds up the ending section of the level. So it's not like traplaunching totally ruins the level either. After all, without trapping, speedrunning that level would be quite boring since you're just racing against the moving platform cycles. And while the traplaunches on Work in Progress were removed, both of those (the bumper launch and the trap off the moving wall later in the level) skipped a significant portion of the level, objectively much more than Side-Stroller. Although supposedly the moving wall trap is still possible though very, very hard. And while the objective of PQ level design was to avoid levels being destroyed by traplaunches, we're only talking about ONE level out of a total of 138. In fact, it's quite miraculous that there aren't many more levels that have been torn to shreds by trapping, considering how many moving platforms PQ levels tend to have. And abusing game physics to the maximum amount possible has always been a part of speedrunning video games in general. It's not like PQ speedrunning involves clipping through walls like in Super Mario 64 or anything.
Anyway, all I wanted to say is (1) currently traplaunches aren't know to affect enough levels to be worth removing and (2) even when they do, they don't completely break any levels. Although there may be some undiscovered traps that might change our opinions on this matter in the future.