Lol, alright lets take this a step back right now.
Yeah most of them don't understand shit and bandwagon what the ones that do understand shit say.
The difference between a mage instakilling someone vs a assassin instakilling someone is that you see them coming vs not seeing coming.
Some assassins you can do stuff against, and guess what. Those assassins are hardly played. I don't know the last time I saw a talon played, or a mid akali, mid ekko, etc.
No the only ones that we see played mid anymore are the ones that can full to zero people and be safe. Zed, LeBlanc, Fizz, Ekko, Kassawin.
Assassins can literally just decide to kill you at full and then do it. Where as Mages have to set up or get you into a advantageous position for them. So if you died to Cass or Viktor. It was probably because you were a little too close, or you thought you could fight them and they said no.
Also; assassins still can poke you in lane. Zed has two things that bar him from being unstoppable. High Energy cost Ranks 1 and 2 early game and Cooldowns. Cass has. Must land Q, be in range for E. Mana. And Has to be close.
Sure we kill people nearly at the same speed. But the difference, is counterplay vs little counterplay. The difference is safety vs semisafe.
A mage vs mage match up is whoever is better. A assassin vs assassin match up is whoever is better. A mage vs assassin match up is A: Is the mage just a much better player then the Assassin, then mage wins. B: Are the players on the same skill level. Assassins will win with one to one and a half spell cycles. Also, how many of those meta assassins mid, have real skill shots? Zed's Q? LeBlanc's E? Fizz's R? Ekko's Q? Each have one Skillshot? Which, Zed has Range with W Q. LeBlanc can W away. Fizz's Ulti literally grows in size. And Ekko's Q is just for poke?
So you saying that we are ANYTHING like assassin players makes you very lacking the game knowledge department. Learn the basics of the game and understand why ADC's and Mages hate assassins. They are the class you can't just outplay without being head and shoulders better then them. Every other class has some form of counterplay for mages and adcs.
Assassins became a problem for a while, so they nerfed them. Then buffed them, Then nerfed them, Then now again buffed them.
The only real way of counterplay against an assassin is rolling into mid or late game, where they aren't as prevalent anymore and even then, you ADC and Mid still have to be careful to not be out of position in the slightest.
We don't see Assassins in Pro Play atm, because not everyone makes that many mistakes up there. But everything under masters make mistakes all the time.