Can someone explain to me why assassins are being nerfed?

First a quick review of the updates so far:

-Adc get a rework and a buff causing massive turmoil -Tanks get a rework and a buff causing massive turmoil when Juggernauts came out -Mages get a rework and a buff causing massive turmoil

So why are assassins being nerfed??

From what I have read the reason is to "extend" how long it takes them to kill you.

Ummmmmmmmm.........Did I miss a step here somewhere? You want to extend how long it takes for assassins to kill? Is this stupid or do I not understand? They have one job, to kill..................

That is like me going to supports and saying "we should extend how long it takes for them to heal their adcs, clicking a few buttons is not long enough."

Or better yet going, "those darn tanks are taking to much damage without dying we need to nerf how long it takes to kill them."

my favorite is "I don't like how adc's can kill me from far away, let's make them come in closer."

Reeallly stupid right?

Listen assassins are meant to kill squishy champions easily, that's their point, that's the whole reason we have them. Their entire kits are created to kill and that's all. They are not supports who can stun and heal. They are not tanks who can go into team fights and do massive damage and take as much. They are not adc's hiding in the back and killing easily. Their whole job is to go in as fast as possible, avoid all the cc in the game (which btw 90% of champions have and it counters assassin's hard as hell since all the tenacity put together doesn't amount to anything) and kill the squishy champions. Then try to get out without being crushed. They literally need to kill fast or they die. That's it. They go in, kill, or die. The end.

Am I missing something obvious?