How many times do I have to say this… of course there are problems with the opening. Of course there are ways for black to get an advantage. I am not denying any of this. I’m talking about playing the odds. It’s not like playing the Stafford where by now everyone knows the refutation. It’s a rare line. If for some reason it becomes popular and a ton of French players know how to handle it, then it becomes a different story.
Even you, just now, said "there's a refutation, but I don't remember it."
If you play the Orthoschnapp regularly and your opponent, who knows the refutation sees it maybe a couple of times a year, you’re not going to be at a big disadvantage. It’s unlikely that all of the correct moves will be remembered perfectly. GM Val Akobian told Eric Rosen that he had seen the gambit maybe twice, and he has mained the French his whole life and plays a lot of online chess.
Again, I’m not trying to evangelize, I’m answering the original question as posted. It wins the most, surprises even experienced French players, and offers a fun wide-open game. 🤷🏼♀️
The problem is that black can gift back the pawn in a way which is winning for black. @pfren posted it on another forum but I don't remember it