When Malphite uses his ground slam, frozen heart, and randuins omen...
for a total of 64% attack speed slow, bringing me from 1.96 attacks per second to 0.7 attacks per second...
oh well should have picked yi and pressed r so I can have 2.5 attacks per second instead because attack speed slows count as slows.
Yi literally does 2.7x the damage to malphite than any other champion could do just considering attack speed, not even accounting double strike or his true damage.
Alright well thats not a huge deal-- i can live with champion counters-- so maybe malphite is just countered really hard by yi in that regard. Maybe. Or maybe being immune to attack speed slows makes yi a better tank killer than anyone else including trundle, even if they don't have innate attack speed slows in their kits-- lets calculate it:
1 / (0.85 * 0.85) = 1.384
So yi does nearly 40% more damage to anyone with frozen heart and randuins omen than anyone else can ever hope to, and that isn't including the on hit true damage or double strike-- just the immunity to attack speed slows.
40%.
Forty fucking percent. Think about that for a moment. Thats like having 400 attack damage at 6 items as Trynd, then getting a boost from an active that temporarily gives you 160 bonus attack damage. Yi's immunity to attack speed slows is worth 160 bonus attack damage all by itself against targets with randuins while within the effect of frozen heart, and worth an astronomical 680 bonus attack damage against a tanky malphite with groundslam. Like holy shit.
The amount of damage yi does from his double strike, on hit true damage, immunity to attack speed slows, 80% attack speed boost, and immense speed allowing him to land attacks at full attack speed against moving targets is so fucking enormous it makes Tryndamere look like a fucking chump.
I've been playing a bit of master yi top, and even though he isn't that great in the early game it doesn't matter because he scales harder than anyone-- i'd say he even scales harder than nasus, and nasus never stops scaling. I've seen yi pentakill pretty much by himself when ahead, and I've done it twice myself, but i've never seen nasus do anything like that. Nasus is much easier to play around because he can be kited and whittled down, but a good yi will kill two people in the blink of an eye and one of them will be your tank.
I'm not saying this as a complaint. I like Yi. I'm saying this because I'm trying to rationalize why I should keep playing Tryndamere top when I could just play Yi top. It really doesn't matter how hard I dominate with Trynd, the enemy is eventually going to build randuins and frozen heart and become tanky as shit. I could just play Yi instead and kill them over and over and laugh at their armor, then group and pentakill their team. I don't see a point in playing Trynd when Yi exists. Hell I don't see a point in playing Trynd when Fiora exists.

+
+ ult takes him to >2AS and with 15% AS slow, his AS is still high. Donno why it is floating around that Yi is AS immune. He is MS immune if ult is active.
. Magic damage means Malphite's weaker because he has to build MR over armor. Constant poison means Malphite's shield isn't up as often as he'd like. Singed is not attack-speed reliant in the slightest for anything so Malphite's E does jackshit to him. Singed can kite him around for days even with Malphite's Q, especially once he's got a Rylai's. Malphite's ult is about the only threat to Singed. AP Malphite CAN be an issue for Singed, but if you're going AP Malphite toplane your team is probably down a proper tank.