What I'm dreading is that they're going to revert to the old hitbox and give us the caustic/gibraltar dmg reduction passive. This won't fix the aesthetic artifacts like in your video above, so people will still come out with things like "you can't hit his legs/head/arms", which are provably false by shooting at your pathfinder friends. But it will bring in a new complaint : "he's too tanky". This hasn't been a massive complaint with gibraltar and caustic, because theyre not as popular. But when you get a guy with that passive on every single team you fight : the complaints will roll in thick and fast.
What should happen is that the separate pathfinder models should have their own hitbox, but personally I think this would be a waste of resources as everyone would stop using the larger ones, for obvious reasons. At the minute people use legendary skins knowing they offer an unfair advantage, that your enemy doesnt know which part of you can actually produce hits. The exact opposite would happen if the larger models had an accurate hitbox to their limbs.
The other option would be to disable and change the legendary skins - they wont do this as people have paid money for them and there would be an outcry.
The root of the problem is that there is NO version of a hitbox which will service all the pathfinder models. They are too different.