As I mentioned earlier, the dislike of Samurai and Black Mage stem from their singular contribution. Unlike any other job, they only offer raw damage. Even an average Samurai offers significantly less than an average Dragoon. I suspect a lot of people blocking selfish DPS jobs have dealt with poor performance and would rather gamble at least getting some utility in lieu of literally nothing. It doesn't help neither bring enough damage to justify their lack of utility. While Black Mage is in a better place, it's still weaker than Summoner by a noticeable merge. And Samurai doesn't come close to upsetting any of the three melee.

Can they all clear? Of course. That doesn't mean PF will necessarily care nor will they be a popular static choice.