Why is overtuning/buffing mage items a thing?
Let´s start off in a simple way.
Which boots are arguably the best?

Which boots had the most recent buffs?

Which boots were the best boots prior to that change?

Next off starting items.
So I placed all starting items in an order, beginning with the lowest winrate.

I hope you´re able to recognize a clear pattern right here.
Following, completed items.
Starting with
This one´s easy.
It´s safe to say that it´s quite niche, however on dot champions and especially combined with
it´s simply way too cost efficient and gives too much utility.
In a direct comparison between
and
we have 20% slow for 1 sec on
, meanwhile
has the same slow for half a second longer whilst being unable to reproc. And yet it costs 500 gold more.
Ingame example:
uses his E, slows his target´s movement speed for 5 seconds, which allows him to easily hit his spell rotation. And we ALL know what this feels like.
Next up 
Why does
give more penetration than
, even though it costs 150 less gold and gives 40 AP more than
gives AD?
Following that, we have 
Why does
give 500 HP 400 Mana 100 AP and a great passive for simply 2700 gold and 10 minutes of passive scaling?
Ever thought about AD champions wanting to have a free scaling source without having to do anything that spikes on itself after completion and even heavier after stacking?
Then we have 
This item might not look broken at first glance, however it has a strong synergy with Glacial Augment.
Despite it´s low costs,
once again gives everything a mage needs in order to not run oom the entire game and have even more utility.
.
Why is
even in the game.
It´s unfun for everyone and for a cost of only 100 gold more than
, you successfully bought an item that is better in 9 out of 10 situations and additionally has a 3 minute shorter cooldown than
.
Heck I even saw ADCs (even those without any ap scaling at all) go for this item before, since it´s often times the only counterplay to champions like
and
.
Also there is
aka another great mage item AD champs will never get access too.
So what makes
special, you might ask?
Well, I didn´t believe it myself at first, however, for some odd reason
has more magic resistance than literally any tank item (
,
and
to name a few).
But as if that wasn´t enough it additionally gives you 75 AP and 10% Cdr and a free
passive.
and
being the best ADC items in S8 says it all.
Next up on the list,
.
Let´s break this down. Let´s use
for example. (You could basically do this with almost every champion btw). So let´s say your mage was unable to proc sudden impact/ doesn´t have this rune.
would still need to reach at least level 9 in order to not getting true damage anymore, as long as your let´s say
bought
and
(which are btw very very common items, especially built in the earlygame). And Keep in mind,
should be up 2 levels by then, which means he has a level 2 ultimate in his backpack.
Even though I already touched on
it´s so incredibly broken that it get´s its own spotlight right here.
Why is an item that gives you great burst, great damage against tanks and some survivability as well a thing?
Or why isn´t
banned for brand players? This would make the game more enjoyable, actually.
kinda has the same problems
has. It might not be as powerful, however we can once again draw a conclusion by directly comparing it to
.
If you take like ten seconds to spot the difference between
and
, you immediatly start to think about why
even is in the game.
with
. All I´d need to say.
Why are AP champions becoming the best turret pusher all of a sudden? Does it really have to be this way?
Let´s take a quick look at
now.
This item lost all of it´s identity. Okay, maybe I lied. Maybe not all of it.
It used to be a burst item. Nowadays it´s a burst item that also gives you infinite mana for the rest of the game as long as you´re not
and your E key stopped working after you pressed it the first time.
And if that´s not enough, well, take 20% Cdr as well. Because that´s what modern balancing looks like.
is also a stupid item.
Useless on most champions, however, as soon as its viable on one, it immediatly makes the champion OP on its own.
Doesn´t sound all that healthy if you ask me.
And last, but certainly not least...
.
,
and once again
.
I´m pretty sure I´d be lying if I´d say this isn´t the absolute most gold efficient item (if you forget
)
Besides that, where´s the AD version of that? Why are mages getting access to over 1000 AP, while bruisers etc. are happy when they reach the 400 AD mark?
So how am I gonna gonna say this... Rito PLEASE fix your game.