Quite the opposite in fact the "gimmicks" as they are often mislabelled are the core identity of the show. The writers go out of their way to make every episode wildly different from each other allowing for the classic Trek ability to just drop in to a random episode.
Each episodes have to be big and eye catching in order to survive in the modern landscape. It is not feasible to make something that will only appeal to us hardcores.
It wasn't neccessary in season 1 and 2. They made an excellent show which focused more heavily on the science fiction element. Those seasons rated and were reviewed much more strongly and were watched by many more people. Perhaps the showrunners don't care but I doubt it given that they've just recently said that they're hoping to get Year One. I hope they do as well but it will require that quite high numbers of people are watching. If they were able to achieve that in season 1 and 2 but not in 3 and 4 then I think there's been a problem. I do believe that they'll course correct for season 5 and recapture what made season 1 and 2 so strong.
I think this season is every so slightly better. I think they've overused La'an a bit but I prefer her story this season to the heavy focus on dancing.