Stop taking Soloque experiences to make balance posts.
Tanks/Mages/adcs/supports WILL ALWAYS BE SUPERIOR to Bruisers/assasins in competitive. Why you ask? Because if you put a bunch of higher tier player who have at least a little bit of experience playing together AND have communication while playing they will easily dispose of a bruiser or an assasin in a fight.
You do not get that assasins and bruisers mostly rely on the chaos of soloque to be relevant and that is why they are not played in the lcs more than 30 % of the time unless they are broken like
whom even if they fuck up they can still manhandle you and provide teamfigth pressence.
If the enemy has a Zed all i have to do if i have communication with my team is tell em how we will procced with the fight in a way all the players in the team are familiar with ( this s where trainning as a team and scriming comes in mind ) in a way that will make him useless without openning us up extremenly to the enemy adc or whoever is the secondary dmg output in the current game OR SIMPLY make the call to back off instantly in a certain route that we can defend ourselves and leave no openning for him to cheese a kill. SAME WITH EVERY BRUISER.
Then we got a tank a guy with too much base dmg for his class and items that can run down with some movement buff or his point and click CC gapclose and be unkillable due to aftershock for those 4-5 seconds needed for his team to properly follow up. How can you deal with that? You can't you just minimise your possition change to the extent of still beeing able to rotate your damage source to the carry for the little time frame he wasted his cooldowns.
Also in soloque people as mentioned above are almost NEVER on the same page. Just look at doublelift and Vincent how they pretty much 2v3 2v4 people consistently out of lane phase with ease. Why? They got communication and similar aggresive playstyles and they both know by instict when they back off together and when they got for the risky play. And you can't use the argument their enemies suck they play vs Masters and challengers daily and i don't see many challengers with 50% or below winrate to mean they got boosted and now they camp the rank you can't camp ranks consistently above D1 anymore.
Tl;dr :Bruisers and assasins are a weak class that rely on chaos meanwhile the other classes mentioned can work twice as efficiently in a competitive enviroment vs players with experience playing with eachother and good communication. So stop taking your soloque experience ESPECIALLY if you are in a low tier to balance the game and flood posts.