Several reasons why tanks disappeared top lane.
Reason #1: As mentioned several champs are just tank destroyers, most of them recently reworked and released, and popular top lane:
AAAANNNNDDD recently released, arguable balanced but still anti-tank jungler
Some of them old but getting out of the gutter:
Also Bot lane anti-tanks being popular

Reason #2: As before mentioned Juggernauts, now Juggernauts are not actually really bad. They have the inherent weakness of getting kited. Unfortunately these items exist
Juggernauts are not bad, it is their synergy with items that make them terror. These items effectively remove their weaknesses and lets them scale well into late game which is the meta right now. Though realistically it is rather nice to have items and champions synergize so well, it would be nice if other types of champions should synergize with their items too.
Reason #3: 99% of tanks have been constantly nerfed AND their items. Again this was to make sure there would be no late game tanks, not even the infinite stacking
Or the ADC hating
This doesn't make sense to have these two mid game champions, and these two got the brunt of it. In a meta where late game is key, there are almost no tanks. The item
was constantly nerfed to beyond the point of "better nerf Irelia" joke. Granted as a tank player I agree that released Cinderhulk was just plain STUPID! But it was nerfed to a good spot, then nerfed again for ... worlds? I don't know. Top that off at patch 5.16 the same patch where Juggernauts and their items came out,
were also nerfed. The reason behind the nerfs were more than likely to make sure Juggernauts do not abuse them. Can you imagine
running around with pre-nerfed
? I dare not.
Despite all of these the sleeper op only late game tank
is seeing play. This is the tank that all other tanks want to be like. A tank that was buffed up instead of nerfed, and even with the items nerf, he and
were the only ones who loves the new
. A weak early game but with a rewarding late game who's kit make it so that he laughs off a 6 item
as he drinks her tears. He is also a top lane tank, reason you're seeing a lot of him now. He's the only arguable real tank left, though probably not for long so if ya love tanks, learn him and abuse him while ya can.