It would be easy enough to devise a test about the profitability of adding to losers in a day trading session over a protracted period of time. I've done it before. And I don't add to losers because I know that sooner or later it is always catostrophic. I don't like throwing away a month or a quarter or a year in one day.
I know it is in another forum, but follow Brixen here https://www.forexfactory.com/thread/1028145-dax-futures-december-2020.
Adding to losers is his whole strategy.
He creates a new thread for every DAX contract (3 monthly). He has been applying this strategy consistently for at least 3 years, but he is well capitalized and knows how to work himself out of a whole - just look at Thursday's posts this week when DAX shat itself and was down over 3% at one point while Brixen had positioned himself Long!