Tristana isn't overpowered nor is she overtuned

The meta is simply in her favor. She does not need a nerf.

People hate her W reset and ultimate. However, her kit has remained the same for quite a long time. She is only gaining popularity as other ADCs started to dwindle away due to nerfs and tuning.

Let's see what made her shine:

• Lethality nerfs. Took Draven, Varus, Jhin, and other ADCs out of the equation for a bit. She could not survive the lethality meta.
• Caitlyn nerfs with runaans and her traps. It made other ADCs look for the next safest thing, which was Tristana.
• This is a "peel" meta. Ardent Censer, tanks, heals, and shields are all helping Tristana with her additional safety. Thus, it's not a problem with her kit design but rather how well her kit fits the meta right now.
• Tristana has not been in the game for a while and people still forget you don't want to fight her when she places a bomb on you - a squishy.

These things have never changed:

• You can still CC her when she jumps unlike some mobility abilities or wall jumps.
• Her abilities have high cooldowns if she doesn't utilize her kit. People don't pay that much attention to this other than higher elos.
• Her burst is delayed due to her bomb. So it is also quite easy to kill her before she focuses on the team.
• Her W doesn't stop point-and-click abilities. Assassins can still easily one-shot her.
• She's immobile for 16 seconds if she hops and doesn't get a kill. Plus, she's slow so Youmuus to get that booty if she hops or Rs away.

Every meta has a champion that fits well. It's not the champion. It's the situation around them. Like Ardent Censer with Janna and Soraka.