"We're so weak, buff AP itemization" - Mage circlejerks
The top 15 win rate champions https://www.leagueofgraphs.com/champions/stats/platinum/by-winrate
Supports take three slots Tanky top takes two Tank jungler takes two Jarvan jungler takes one Assassin takes one ADC takes one Mages take FIVE
This is for plat+. Here we have mage mains circlejerking about how bad they are in the current meta yet numbers shows otherwise.
Twitch, the highest win rate ADC has an average of 5.8 deaths while every single mage in the top 15 win rate list has a lower death count that him with Anivia enjoying a 4.4 death per game.
If AP itemization were truly bad, mages would not occupy one third of the top 15 highest win rate list, or have less death compared to the "unkillable adc"
What mage mains are experiencing now is the feeling of being dominant so long to being less dominant. Mages are by no means weak. They are balanced in this meta. The only roles which has the right to complain about being weak are assassins and juggernauts.
I don't really buy into "Tanks will buy mr and invalidate mages" with CC and CDR being so accessible, a mage coordinating well with the support will make it so tanks won't reach them. Not to mention, the majority of tanks will lean towards building armor from the threat of ADC instead of heavy MR for the only AP mid lane.
Mages aren't meant to be the one role to counter all. Deal with it.
. Gunblade is really strong. DFG was broken during its time. It wasn't until this season that tanks and supports finally got to play with interesting actives (tanks only had a slow for ~3 years), though Cho makes Stoneplate completely ridiculous.
excluding essence reaver.

excluding lich bane and void staff
that leaves 2 items up to someone to choose and a majority of mages need 1 of the others to function so that leaves 1 item. so please stop commenting when you dont know what you are talking about

and 
and
aren't picked because of a specific gimmick?
and
games... why?
BECAUSE THERE IS NO OTHER OPTION!!!
upgrade and no one bother building MR now anyways because of the state of AP
Ok.
not being a terrible rush into an AD match ups that doesn't sacrifice everything from the mage to potentially live 1 more auto attack from ADs. I'm not asking for extra stats on other items or more AP items (though more AP + armor items are kind of needed).