We need to talk about assassin design philosophy
We need to do this with every class to address items, snowball, and damage.
What defines an assassin?
Are they champions meant to 100-0 squishies or kill low health targets? If someone is mispositioned or not with their team, should they be able to die? Should assassins be able to 1v1 without the element of surprise? Do they need to snowball to do their job?
We need to go back to square one - our foundation - and define the jobs of champions. Sometimes a target is positioned pretty well but still dies due to the damage. Other times, if assassins don't snowball, they just get shutdown. Tanks can't even handle their damage at times along with their slipperiness despite being their counter.
We also need to do this every class except tanks. Bruisers with the sub-class of assassin need to have a look at too. Irelia/Jax - what is their intended job. We need clearer checks and balances. Clearer strengths and weaknesses. Not just CC the enemy.
I think starting with assassins is a better spot to start and then bruisers since the bruiser class is more diverse in their jobs.
It's also what I want to focus on in this thread. Ask yourself this even if they're basic questions:
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Should assassins 100-0 squishies?
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If yes, why? If they are with other team members with shields/healing, should assassins be able to get through that? However, if they are how do you counter them? Tanks? But they aren't seeing play due to the true damage and shred?
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If no, why? Should they 50-0, 70-0, 40-0, 60-0 squishies or kill low health targets? However, wouldn't that mean enemies need to be brought down low in teamfights by abilities like Brand ult?
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Should assassins be viable with/without snowball?
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Should they be able to 100-0 you if supremely fed?
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Should they spike hard with items?
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Should assassins have lower defensive attributes?
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Should they be able to build tankier items?
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Should they be required to build tankier items in exchange for damage or be a slippery glass cannon?
I think these are good points to start.

I guess?...

. Immobility is probably one of the few constant things that keeps Kayle under control.