It should be noted that Kristoff won a sprint for UAE in the first Tour Pogacar won. And Evenepoel likely enters the 2024 Tour with similar odds of winning/fighting for the win as Pogacar did back then. Really, if you have a <50% chance of being in the battle for the win, you don't need 7 support riders.
The real issue is not going for secondary objectives in combination with Evenepoel's GC bid, it's Merlier being ill-suited to the secondary objective role. He isn't the kind of sprinter who freelances particularly well and would therefore need at least two leadout riders, at which point the argument that Evenepoel's support is being hurt becomes much stronger because none of them are going to be able to help Evenepoel much. In addition, at 31, he has never rode a GT in which he both reached the second half of the race and won a stage, so it's rather questionable how much you're going to get out of the slots he and his support would take up.
And this is also where you see that Merlier's career planning has been godawful with regards to getting to start the Tour. Stayed at Alpecin too long and was sidelined in favour of Philipsen as a result, then rather than going to a bottom-two-thirds-of-the-WT team that would have happily sent him to the Tour, he went for the allure of Belgium's biggest-name team at a time when they started to build completely around Evenepoel. If he's actually surprised that he isn't getting to do the Tour for Soudal, he only has himself to blame, and in that light his comments in the media are rather silly. With two more years on his contract, the second Tour start of his career is unlikely to come before age 33 (and much closer to 34 than 32 at that). If that isn't a sign you're wasting your prime as a sprinter, I don't know what is. He really should have thought this whole thing through better. And, to be fair, so should Soudal - IMO they would have been much better off spending the money on reinforcing their ailing classics squad than on a big-name sprinter who they have never used and don't look like ever using for a single of their main objectives.