Rain check on this. Might wait and see if Rito says something, mid-season, or do a patch with Marksman buffs or nerfs.
The ADC problem is really complicated and can't just say "Just buff the role". Might too big anyways for Riot to actually spend the time and reconstruct the role https://twitter.com/FarronDS/status/1252176857031749632

I will just list the things I would target/change:
-Remove energize passive/rework this into something else with Static shiv being the main example.
-Supports didact the lane too much.
-ADCs ride the line of burst or get bursted. More on this later.
-Rework the idea of crit

-More emphasis on AD and AS instead of Crit. Crit should be that special feeling of power.
-With less burst for ADCs, there are excemptions like Jhin, give them more base stats while actually being that consistent dps so they don't die to one ability.

I can go on but this thread would be a ramble without going into detail. This is a time however where I wish a Rioter was able to communicate with the community talking about the role. Same with every role. Some of these issues connect to the overall game such as other lanes. Top