… the OP is low rated. So they figure his opponents will not know anything anyway, might as well play something that will trick them now … With dubious openings like the Stonewall Attack or Blackmar-Diemer Gambit, the moment you get to a certain milestone, like 1800, you will have to start over. ... The Ruy and QGD can be played for a lifetime. … I do not say the Stonewall Attack is a bad idea just for the sake of stirring up ruckus. I am trying to make you an all around better chess player!
A very commendable explanation, and one that did not require a "hot garbage" exclamation. As I explained before, I was glad to see someone write (in this thread) something about the problem with choosing the Stonewall Attack. I am even more grateful for your subsequent exposition, making it clear (I think) that it might work for a low-rated player, but would be a serious problem at a higher level. I think that it is worthwhile to spell out that point because some players may have no intention to get anywhere near 1800 while others may be willing to accept the inefficiency that would be associated with a quick-fix current opening choice combined with a plan to change later. One can disapprove of such choices, and, in the interest of trying to encourage someone to be an all around better chess player, one can point out a possible different choice. However, such encouragement seems to me to be more likely to be effective if it is expressed with explanation and without an apparent attempt to engender negative emotions.

I think you hit the nail on the head.
They all seem to be sensitive and defensive because the OP is low rated. So they figure his opponents will not know anything anyway, might as well play something that will trick them now and be totally useless later. It would be like a beginner basketball player playing Point Guard saying "These are all rookies I am facing, how about I dribble the ball while running up the court backwards?"
Instead, I always encourage people to start with openings that follow all the fundamentals of good opening concepts while sticking to those that are simpler, such as the Queens Gambit Declined and Ruy Lopez. Neither one violates rules like throwing the Queen out early (Scandinavian), Not grabbing your share of the center or space (Alekhine, KID), or that create glaring weaknesses early on (Najdorf-d5, Stonewall Dutch-e5, etc).
With dubious openings like the Stonewall Attack or Blackmar-Diemer Gambit, the moment you get to a certain milestone, like 1800, you will have to start over. Something like the Colle or London, at least White is still fine, but you will never get more than Equality.
The Ruy and QGD can be played for a lifetime. When you reach 1800, I highly encourage you to explore other openings (Sicilian, French, Caro-Kann, Grunfeld, KID, Nimzo-Indian, Slav, Semi-Slav, Dutch, Modern), but if none of them appeal to you, you have something to fall back on. You play the Stonewall or Blackmar-Diemer Gambit or the Grob, you have nothing to fall back on. Having the Ruy and QGD is like having a backup fund for 6 months if you lost your job.
I might be one that plays the French and KID, but if I had to, i could always fall back on the QGD and Ruy - I know and understand them both from both sides.
I do not say the Stonewall Attack is a bad idea just for the sake of stirring up ruckus. I am trying to make you an all around better chess player!