For certain sports and wildlife shooting pre capture is a game changer. You get shots you would not have been able to get otherwise without shooting non stop trying to anticipate something is about to happen.
As I said in my post, when the R6ii was released there was no R1 or R52 close to being released. The R3 was the premier sports camera in the canon lineup. It would have made sense to release the crappy precapture implementation of the R6 as a firmware update to the R3. It would have made good marketing sense. People who were in the market for the R3 and really needed pre-capture my opt for the cheaper R62 just to get the feature. It turns out that the feature was garbage anyway, as implemented, but you wouldn't know that until you used it a bunch of times.