Like i said earlier, if you are a decent player you dont need to be told that by the game via achievements and by getting showered with unique rewards, you either know that or you are extremely insecure and need outside entities to congratulate you to feel validated, this system actually leads to extreme elitism and can be seen in WoW where literally you see posts like "You havent done X high end content so your opinion doesnt matter" because in an extremely elitist and tryhard community like that all that matters is doing high end content and showing off achievements/rewards you might not even like how they look. (Oh and this "nobody is stopping" you excuse doesnt work on someone who has played WoW and can see how such communities work, good luck making groups or joining groups with a non meta class in the extremely toxic, elitist and metaslave pug community that is WoW, or are you the kind that tells everyone how easy it is to find good friends or jump from fc to fc until you find a decent one, yeah when you have to go through this much social trouble, it is gatekeeping because this is a VIDEO GAME, NOT A JOB YOU HATE but have to go through because of the reward)
I was in the minority of people whose ego doesnt depend on video game achievements in that game so I would have absolutely zero problems with bringing back old mage tower/unique appearances so new players can get them nor would I have an issue if people who just did casual solo content had a path to mythic gear since I would still get it faster, but the elitists who want to keep everyone down and want to delude themselves that they achieved something in life are extremely attached to all those "elite rewards" so they dont want to share it with others because "omg I wont get to feel special anymore"
Content is meant to be done because it is fun and you enjoy it, not purely because of the rewards and the delusion of "prestige" to help with your self esteem issues, sadly gamers often have self esteem issues and get hooked into the feeling of "I got this special reward cuz I did this elite thing" which leads to incredibly obnoxious people that turn the community toxic.
So absolutely NO, rewards should be available to all and people should get them cuz they like them, not for the reasons I mentioned.