Maybe if you are talking about season 6 or the beginning of season 7...
The state of top lane right now is nothing like what you describe (except for tanks dealing a lot of damage... that part is too true)
Top lane is the lane that only matters in the case of a tie breaker. If one team's bot lane wins hard, you dont matter. If mid and bot on the same team win even by a small margin, the overall advantage is enough to carry the game sans throws. If all things are equal, and there is no real lead, that is the only time your lane matters.
This game is SUPER snowbally. Not just in top lane, but in all lanes. Bot lane snowballs the harderst, because the ADC is the late game damage dealer. The sooner they get their items, the less time you have to make an impact in top lane.
Top lane used to be the snowball lane, because it was filled with bruisers, who fall off in the late game. It was their objective to get a lead early and snowball other lanes. Because of how fast bot lanes are reaching their item spikes, this window, where a bruiser top lane can snowball and push a lead is laughably small. That is why its better to play a tank. You aren't looking to snowball the game, you are looking to be useful when your adc gets their items and its time to team fight.
Of course, the events that lead up to this are simple:
RIOT adds first turret gold (bot lane tower doesn't get any starting bonus DR)
EVERYONE goes bot lane to get that first tower gold
LOL ADC 2017
ADC items get cheaper
Ardent censor happens
ADC can now survive the bot lane fiestas (because supports op)/and get their item spikes a lot sooner.
RIOT gives bot lane tower starting DR
Fiesta's bot lane lessen
ADC's can now actually farm during the lane phase since its not constant ganks.
ADC's items remain cheap, so they spike even faster.
All of this adds up to the bot lane remaining the most important lane to snowball, because the sooner the ADC gets his items, the sooner you can faceroll the enemy team with right clicks.
Top lane loses what little influence it has the faster everyone who scales gets to scale faster. Top lane carries are still typically melee, which means ranged will still win out in the end. Not only that, but with the current preseason changes, top lane carries are getting absolutely destroyed by tanks, so they aren't getting to scale. OR because they are melee, they are getting plagued by ranged poke, so that they can't farm, so no scaling. So whether its being poked out of lane or dying to tanks, melee bruisers and carries are not surviving long enough to matter.
The only way top lane gets to be something other than just another support lane, is for ranged ADC to take longer to reach their item spikes.
I think top tank is a fine strategy if you are building a team comp around protecting your late game carries and fighting as 5, but in solo queue specifically, you can't depend on your random teammates to always be on the same page. Having the option to try and carry the game yourself would be nice, and while I wont say it isn't there at all, I think by attempting to carry from top lane, unless you are just leagues better than your opponents, you put yourself (and ultimately your team) at a severe disadvantage in the game.
Sorry, I know that was a lot.
TLDR-
Tanks deal too much damage.
Supports are still REALLY strong.
Ranged ADC scales too fast.
= Top lane playing anything other than tank is a disadvantage. You COULD still win, you COULD carry, but your window to do so as a melee champion, especially a bruiser, is incredibly small. You have to be leagues better than your opponents.