For trying to get into a midcore static or above, your FFLogs is like your resume. For better or for worse it's a good first impression you make on a group you're going to be promising a lot of time to, and in turn they're promising a lot of time to you. The trial process takes a lot of time, usually several raid days (read for some groups: weeks) and because of that filtering for a specific kind of player is very helpful for reducing the amount of time trialing.

Most midcore and up will follow up FFLogs research with an interview and a few trials. I've participated in more than a few trials both for my static and as a stand in for a friend's group, many in Ultimate itself, to see how people get along. For our own purposes because we prefer to go blind on prog, we test the trial player's ability to puzzle through mechanics and ability to communicate effectively moreso than their actual parsing ability, but that's not a universal thing.

If you're denied a static, you're not denied content. You are always able to pug extreme and Savage content, and there are communities dedicated to pugging even Ultimate content. No, being denied a static means being denied other people's time, and being saved from wasting yours.

Square Enix can never and will never force players to get along with each other. Chances are that if you were denied at stage 1 of the process like that you wouldn't enjoy being in that group's presence either.