No, it would be a bit stupid to understand it that way. It's even a stupid way for you to phrase the question and implies that maybe you should be asking that question you thought was rhetorical.
The lawsuit is complaining about the power of the recoil, not it's mere presence. And that is a design parameter. And they could have designed it with more or less recoil (and if you look up the history of the weapon you could actually know what they did about this point).
Not so. There is no unit of measure or actual figure cited in the lawsuit for either (1) how powerful the recoil of an AR-15 is, or (2) what numerical threshold constitutes excessively powerful. In the absence of any figures or any basis for comparison, the descriptor "powerful" is meaningless. Any recoil at all dissipates energy over time; that is to say, it has power. If that's what the plaintiffs mean by "powerful," then indeed they ARE complaining about the mere presence of recoil. If they mean the power exceeds some acceptable threshold, let's see the figures.
For what it's worth, I looked at multiple reviews and comparisons of the AR-15 versus other rifles with similar shooting characteristics. They generally describe the recoil of the AR-15 as unremarkable. (If you want to see video of a guy firing multiple rounds with the butt held against his nose, YouTube is your friend.)
Conservation of momentum is demanded by Newton's third law, not gun recoil.
The function of a gun is to rapidly impart a lot of momentum to a projectile. Recoil is the inevitable result of that fact, given the law of conservation of momentum.
The engineering of altering or minimizing recoil in a firearm is complex. There are mechanisms that do indeed reduce recoil by reducing the forward momentum of the mass ejected from the gun during a shot. Not, of course, that of the projectile (except a little, as an undesired side effect) but the additional combustion gases also normally ejected forward. By redirecting some of that gas to eject backward instead, a net reduction in total recoil is achieved. There's a limit to that, though. To completely negate recoil, a mass of gas or other material equal to that of the projectile (plus any forward-venting gases) would have to be ejected rearward at the same speed. (Or a smaller mass at proportionally higher speed, etc.) That's practical for some artillery but not, for obvious reasons, for a hand-fired weapon.
Other recoil-ameliorating mechanisms involve moving masses and springs that temporarily, for as long as the mass keeps moving rearward, compensates for the initial recoil. When the moving compensating mass comes to a stop, though, its momentum is imparted back to the gun. So the momentum of recoil is not reduced at all, but it is spread out over time, up to (but not exceeding) the cycle time of the automatic weapon. This can have some benefit, but since it doesn't reduce the recoil momentum, it would not have any effect on the workability of a bump stock device that makes use of that momentum.
And your earlier stupid assertion about Gorilla Glue as if it were the only alternative to how they could mount the stock make it's look like you're really desperate to keep mass murdering weapons around.
The lack of any suggestions in the lawsuit regarding what manufacturers should have done to prevent owners from removing and replacing the stock forces me to speculate. And if you'd read carefully, you'd have noticed that Gorilla Glue was not my only suggestion. It's true that I was unable to come up with any suggestion that was truly practical. Perhaps you can do better. The plaintiffs couldn't, though, and that's what matters. In the absence of any such specifics, that aspect of the suit does indeed amount to complaining that guns are manufactured out of assembled parts.
As for what stating these facts makes me look like, if I saw you setting out to hike fifty miles across a desert in high summer wearing flip flops and carrying a half-liter bottle of Pepsi, and I pointed out that you're not adequately equipped for the task, would that make me look like I'm desperate for you to get stranded and die of thirst? This suit will fail because it doesn't make an adequate case. Clapping my hands and proclaiming that I really truly believed that powerful recoils and removable parts create liability wouldn't make any difference. What I want has nothing to do with it.