In my opinion, for Marksmen to be a healthier class, Riot should flesh out their gameplay niche

Currently the way Marksmen are picked is according to this graph: ->Which one deals the MOST damage ->Which one deals that Damage with the least amount of effort

The champions that fit these criteria then become pick/ban material and grossly overbearing, mostly because ADC's all serve the same Purpose: Reliable Ranged DPS (Or BPS in some cases)

Which greatly limits champion diversity. And not only with other carry classes other than Marksmen but their in-class champions as well. There's currently no reason to pick something like Ashe or Jinx when Tristana/Twitch/Vayne are open.

Which leads me to the main point I'm trying to make: #Marksmen need to have their tactical role in a team fleshed out more

Marksmen should become more than just the BEST damage pick in said role, but rather offer interesting gameplay niches based on the specific Marksman's kit so that they can be picked to complement a team's strength or make up for their weaknesses.

They should not strictly be balanced around Damage as a whole but rather HOW they contribute to their team.

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For example:

Would be your GO TO picks for team comps that rely heavily on Pick potential and Utility, with both of them providing strong CC to not only catch people out of position but also to contribute to their team with more than just DPS

and would be the Flanker class ADC's. They'd rely on navigating through enemy lines/outside of them to get in a position to strike. They'd play more like Assassins with them having good target access and ways to outplay the enemy team but they would lack the tools to fight when they're being caught off guard themselves

Would be THE picks to deal with heavy Frontlines and serve as the primary SHRED machines, having the highest potential DPS and TANK shredding but requiring a lot of ally protection to do their job. They'd also provide the highest potential objective control due to Kog's W and Kalista's rend

Would be the CLEANUP/Teamfight ADC's. Their job would be ending a Teamfight once it started by utilizing their reset mechanics to clean up low Hp targets and then continue on from there

Are the SNIPERS and Siege Marksmen. They'd have superior range and good setup in form of Traps, Deadly Flourish, Curtain Call and so on. They would be picked to stay miles away from the enemy team and contribute with their superior range, providing their team with great sieging potential and ways to keep the enemy team at an arm's length

Would be the BURST "YOLO" ad's that would heavily rely on snowballing and destroying squishes through their insane flat damage and potential burst. They'd be early game bullies that focus on gaining a lead and then winning off of that.

Are the Spellslinger class that would excel at dictating the flow of battle through their superior mobility and "Hit and Run" tactics. They would be lower range than most ADC's but their mobility makes theme extremely elusive and self-sufficient.

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By fleshing out a Marksman' role Riot would actually open Bot lane up for other picks like Mages and bruisers as well. But mainly give people reasons beyond DAMAGE to pick ADC's and thus put an end to these stale metas where just FOUR ad's are consistently god tier and the others just flat out suck.

Mage picks like and would be good bot lane alternatives if your team is sufficiently stacked with Physical damage whereas bruisers like would be the go to picks for comps that want to Brawl and Skirmish and already have sieging in form of Jayce/Gnar/Azir. Even Divers like Jax or Irelia would be good alternatives if you needed target access carries on your team.

All in all I think Marksmen as a class would benefit greatly from fleshing out their unique roles in a team comp instead of just being cookie cutter DPS machines.