This game's fanbase has a love of this idea - of "doing content properly". Personally I think it's a bit of a mistaken folly: what, exactly, would be gained from making people do old content without any kind of stat boost? Older players would quickly get tired of it if they don't get their rewards instantly - hell I still remember back when I first joined this game in Heavensward trying to get any kind of Extreme Trial group for the basic primals was nearly impossible. Players would pitch fits if even one member of the group didn't know what to do flawlessly and rage quit over a single wipe because everyone was tired of doing them - and the mounts, back then, were still desired for people! There were incentives to do that content. At least now when matching up for older content like raids there's a much more relaxed attitude because several expansions out there's a lot less worry that it'll be a heavy slog. People explain the mechanics to new people instead of yelling at them that they should've read the wikis and memorized the youtube videos, even when it's something like the later omega fights or even eden raids, and we just blitz it down: and sometimes there's some accidents as players learn mechanics they're unfamiliar with. But there is, in general, a lot less stress and anger over it.

And as for newer players? I don't feel like this really incentivizes them to do older content either. There are always systems and mechanics that ask you to do old stuff. Whether it's an achievement, your relic weapon grinds, or simply realizing you have that old quest chain for coil you never did and maybe now you want to see what that's all about. This game re-uses mechanics and concepts often enough that there's nothing really vital about, say, doing the Nael Deus Darnus fight 100% as it was originally intended (if that's even possible given how mechanics have shifted over the years) compared to blasting through it with one or two friends so you can experience the visual and audio of the fight. If you care about the experience and mechanics as they were: it's always an option - or you could even do one of the later game fights that just reuse the same mechanics as they often do. There's nothing to really be gained by trying to force people to do it as it was on release.

Not everything needs a unique reward. If the sense of achievement for doing something for the sake of doing it isn't good enough for you: then why are you doing it? We should stop encouraging devs to make boring, unfun, slogs gatekeep the coolest rewards. It seems pretty dire to me when half of a game's userbase are doing things they hate, and actively complain about it, solely because they want an item.