Starfleet Academy is look forward looking ground in both terms of continuity and content, so I'm not sure how that applies. I will grant that Picard seasons 2 and especially 3 went overboard on the nostalgia, but I'm not going to condemn the entire current output of the franchise on that.
Otherwise, for me complaints of "fan service" in modern Trek tend to just boil down to people complaining that they're putting Star Trek in their Star Trek. The more history a franchise has to draw from, they're more they're going to draw from and expand it. Seems pretty basic to me. At this point, to my mind the overuse of the phrase "fan service" has put it in the same category as the phrase "canon violation".