Idk. I have a bunch of unobtainable things like MoP/wod challenge mode transmog, glad mounts, weapon illusions, titles, old recruit a friend mounts, etc. the only reason I use any of them is because they’re rare. If anyone could get these I would probably use them all way less or not use them at all.
There are a bunch of things that I wish I had super badly like cataclysm glad mounts and wotlk pvp tabards and cata elite pvp transmogs but if I could just get them then they’re not cool anymore.
Some stuff being temporarily obtainable while most things are permanent is fine imo.