I agree with OP it's a little ridiculous. And 1-50 they do tie to level, then after that yet don't so it is a little funny IMO. Even on equip sets, they say ILvl of wpn and job, implying I have a "lvl 90 blm". And my 50 Smn is just a "45 smn". So yea they kinda do tie it to your actual level. I'm not saying its a big deal, but I do think it's sloppy and I do roll my eyes.

Personally I think an equip level a rarity-tier is better. But at te end of the day I'll enjoy the game so whatever.