People don’t directly lock sam and blm out because they don’t have utility, they lock them out because they’re not strong enough to off set the lack of utility or are misinformed of how strong the job is in general. For example, BLM will give more to your party than an equally skilled RDM because of how low it’s personal dps is and thus the probability to increase their logs and kill time is higher. Embolden is mainly considered weak because RDM isn’t strong enough for embolden to fill in the disparity between its dps and the other jobs while brd and nin personal dps are equally as low both their utility fills in the picture for them. I promise you, if BLM and SAM were meta, they would not be locked out of any content regardless of utility since the community would have a far better opinion of them. SMN utility kit isn't exactly the most powerful, however it's high dps does a great job in filling the holes. Utility is important but the best jobs are properly balanced around their personal dps too, just having utility doesn't mean your job will be perceived as good
The "Hate" you're worried about is the product of the top players memeing the job into oblivion and everyone else just assuming the job is dysfunctional. The only valid issue with BLM and SAM is that they're far too risky to bring because they have no utility and aren't nearly as powerful if you choose to do so. if the reward was better, you'd see these jobs more