As numerous people in this thread have already explained in great detail, wanting Ex Primals to be put back in the RF has NOTHING to do with discrimination against new players. It has everything to do with the fact that the raid finder is currently the only interface with the option to filter out RUDE, DISRESPECTFUL, TIME WASTING individuals who have no idea how a fight works and join a party of people who state, VERY CLEARLY beforehand, that they are looking for fellow players who have completed it already and can farm it multiple times. These are people who are looking to enjoy the game on their own right now and not wanting to teach WHICH THERE IS NOTHING WRONG WITH!!! So the newbie joins their party (already disrespectful), doesn't speak up (adding more insult to injury), everyone gets pissed off and the party disbands. No one had fun and everyones time was wasted.
So yes, either the trials need to go back into both the RF and DF or the option to filter newbies out of farm parties in the PF needs to become an option just like RF currently has. And to everyone saying "ZOMG you filthy elitists just want to keep all the new scrubs out of content, you hate them and are being toxic to them" and "How are newbies supposed to learn if they get shunned from content like this??" Well ask yourself for a second, who is the more toxic person? The one who asks beforehand for people with experience or the person who ignores their reasonable request and trolls everyone? And as for how newbies are supposed to learn without vets to teach them? Well that's simple as well!!! We so called "vets" were once newbies ourselves and spent HOURS beating our heads into the wall wiping multiple times to learn these trials ourselves before they got nerfed and we didn't have any vets to teach us the mechanics!! If we could do it the newbies can too!
TL;DR Yes we need an option to filter out the trash.
/endrant
P.S.
Paragraph 1: Sounds like a personal problem. Vets aren't here to teach newbies, we are here to have fun just like they are. We have zero obligation to assist anyone yet sometimes we still do out of the kindness of our hearts. They should be grateful for what they get. If you are concerned about people using it to filter newbies out of MSQ content simply don't allow the "No Bonus" option to be selected for things like MSQ dungeons and Roulettes.
Paragraph 2: Yes people do farm in the RF. I got my first ever Soph Ex clear in the RF and many many successful clears after that because after I finally cleared it with other newbies at mt own level I had a good enough understanding of the fight that I could farm it. Everything after that was cleaning up little mistakes here and there. After I cleared it I was able to select the option to join only other people who had cleared it as well and our success rate only went up after that. It is a good system that I found was largely beneficial to everyone and was only decried by the trolls and people looking for carries.