As long as Rapid fire and static arent nerfed then marksmen like trist and Vayne will continue to be an issue-
Trist was literally nearly unplayed months until the static buffs at which point some started playing her but once static and RFC got tweaked together she instantly shot through the roof.
Vayne was also buffed for some incomprehensible reason.
Want to fix marksmen? Ardent is a good step but it's not the end of it.
Twitch needs to have his Q-R combo nerfed, Vayne needs be gutted in her current condition, either you got massive crits or you can kill tanks, not both.
Except she also has mobility and stealth-----that doesn't really make things better.
Then as mentioned, static nerfs so that marksmen like Cait and Trist stop being so strong, it's honestly a wonder that it hasn't happened already.
Back when Cait lost hurricane synergy for her passive and got even stronger with static builds people already called for nerfs to the item, as many already did after trist got broken with it.
Instead Riot chose to gut cait and ignore the items and trist, see where that has landed us x)
But at the same time i believe that marksmen like kog and Varus are necessary for the current game, at least until tanks are nerfed, since only kog, varus and Vayne are any good at killing the tanks we got these days.