It's because PC players, are used to using other 3RD party programs, mods and addons in the games they play.

It's a feeling that propels them to act as if, they are some how entitled to their use of them, because of whatever reasons they make use of, to mask their own inability to play a game w/o them.

It's akin to, athletes using synthetic injections and steroids to have an advantage over those who don't, they require these tools to make of for what they're lacking.

Don't know your rotation? Download an Addon.
Don't know where not to stand during any given fight? Download an Addon.
Don't like not know how your DPS stacks up in the instance, while also wanting to know others stats? Download an Addon.

There is an endless cycle of Addons to take pretty much any guess work, out of any part of the game, including crafting, market board selling, economy shifting ect.

If you're not confident enough in yourself to clear certain content w/o the use of Addons, then look at yourself and how to improve, over needing 3rd party help to bridge the gap between player skill and demanding content.