All SE sites must have a feature where the first 1 hour to answer my posted question, should be reserved for my favorites, who I think have better explanation methods or something exciting as this.
What would this possibly accomplish?
If I'm not one of your favorites but know the answer, the system actively preventing me from responding immediately is not going to result in my setting an alarm or something to come back and do it later. So then you're stuck hoping one of your favorite people does know the answer, which is not at all guaranteed. In fact, on top of the system-level annoyance, it tells me you don't think enough of me to make me a favorite, which will possibly just make the blocked user even more hostile toward you.
(Now go work on your accept rate.)