It's honestly stupid how easily assassins can avoid tower damage...
Fizz has playful on like a 4 second cooldown with max cdr, Zed and Leblanc have their stupid instant repositioning abilitities (and Leblanc also has her clone to tank tower hits), Talon can just vault over the wall after getting his kill, Kayn can also go through the wall after diving you, and he has untargetability with his ult if another enemy is nearby after the tower dive, Elise has her spiderlings to tank the tower AND can go untargettable with rappel, Katarina can just shunpo to whatever she wants (ally, enemy, whatever) after she's had her way with you, and of course there's Akali who can dash to an enemy after she's done (she is arguably the least safe of the assassins tho, since she can ONLY dash if an enemy is nearby). Towers truly are worthless in this game.
Oh and I'd also like to add that Yasuo can't do ANY of these things. If he dives you he's going to get f*cked by your tower, unlike assassins with their numerous safety mechanics.
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Naw bruh, just throw out a windwall and they can't fight back.