Can't vote since my opinion is not on there. Basing the endgame arround iLvl is reasonable, but not with how random iLvl is distributed right now. If you get consistently lucky with your weekly chest or with warforge/titanforge procs in heroic or even normal ToS you can be a bad player with better gear than people who cleared mythic ToS. At least you don't get credit to your maximum iLvl by having a lot of legendaries anymore.
But right now if you're building a group you have to set your standards REALLY high to be safe. Had players with shown iLvl ~915 do less damage than my guildies did in emerald nightmare mythic during progress while at the same time having no clue about any mechanics.
Which is actually the reason iLvl is not the main determining factor of getting into groups (at least m+ groups). Can't really trust the iLvl of a player anymore. It just helps deciding wether it's worth it to look the player up on wowprogress.
True and partly blizzard's fault. They keep saying they want iLvl to matter and upgrades easy to see. But me losing 200k dps by equipping my highest possible iLvl proves the opposite.
Can't really compare that to how it is nowadays. Back then it was number of legendaries > general iLvl of your items, because they pushed your iLvl more than anything else.