I can agree with the OP that gear shouldn't make you feel you are better player than another, however this game is GEAR based so in turn generally the more geared you are the better you can handle a fight.
I am full I lvl90 mostly myth a coil choker and a ruda EX ring, all the gear I have now is the best I could acquire the fastest between coil, myth grinding (which everyone does, and shouldn't be down played as it is a major part of this game and alone not an easy task to gear out one class even with the 450 cap) and various other dungeons and gameplay! i dnt have the time to play most do and i still mananged to ilvl 90 my SCH plus level many crafts to 50, i consider myself a highly experienced player and I am.
People need to realize no matter how gear ppl are if they never played a fight or do not know the mechanics yet they wont play very well, it doesn't matter where your gear came from as long as your character is properly geared for any fight you choose to do (and being full i90 affords you the ability to take on any fight you choose).
ilvls don't just show how long you played, its a smack in the face to all the grinding many ppl put in to say so! they very much show how experienced you are and the amount of play time you have actually put in! This shows that a player is capable of learning a fight properly and eventually will be able to perform a fight correctly once they understand it fully.
the only difference in coil gear and myth is the random factor of how you get the gear, myth is certain if you put in the time, coil is random weekly (it is totally possible someone has horrible luck and can't get any drops from coil at all and is stuck with full myth, this does not make the full myth player bad (most of them I find to be better than coil players that think clearing coil t1-t4 is such a huge accomplishment -_-)
fact is no matter how you gear out, no one is a going to be good unless they know a fight and even then the team they are with has to also be properly prepared to the fight! this is a team game, its not so much about what gear you have its how you use that gear in a fight!
TL;DR ilvl shows what the player's potential to perform is, not the actual skill they have and ppl shouldn't consider full myth as meaning bad player!