Leave no Trace was one of the skills that really made Fl4k who he is - giving him powerful ammo mitigation and the ability to hence break certain weapons. And such skills are crucial to a class, they give them character and specialisation, and make them unique. There was also no denying that it was a little too strong, giving multi-pellet weapons the ability to fire infinitely.
But the nerf to LnT has been extremely heavy-handed, and I think basically everyone agrees it is terrible right now. By gating the ammo refill behind a timer, it is absolutely worthless with any weapon with a fast RoF, and any weapon with a low RoF does not benefit from it very much to begin with. Right now, the skill is just a much worse version of Moze’s Cloud of Lead (which gives 25% ammo mitigation with no cooldown) and Amara’s Dread (which synergizes with high and low RoF weapons by refilling your magazine on kill).
If something is too strong and gamebreaking it definitely needs a nerf, but after the nerf, it should still be one of the class’s best abilities, not one of their worst.
There were many ways to balance LnT without actually ruining the skill (I can guarantee almost no Fl4k players are gonna spec into it anymore). Here are some suggestions and I hope Gearbox will look into it and implement them instead:
Give asymmetric buffs for different weapon types. LnT was obviously broken with shotguns, but I feel it was clearly working as intended with your snipers and smgs. So something along the lines of 12% for snipers and heavies, 10% for pistols, smgs and ars, 5% for shotguns etc.
Gate it behind a timer of 1.5s, but allow it to refill your entire magazine instead of refunding 1 bullet.
Make it a critical kill skill to balance it - and also because it will proc by shots fired, it will not be broken by multi-pellet weapons - all weapons have equal chance. “Hunter skill. Critical kills give you a 12% chance not to consume ammo for 5s”.
I really hope Gearbox takes up these suggestions, because LnT was really one of the skills which made Fl4k who they are. I totally understand it needed a nerf, but just wish it was less heavy-handed. Maybe @Noelle_GBX could help bring these suggestions up?