I believe you but I already use vinegar in small quantities for years just to bring the pH down to around 6. My plants thrive.
https://sciendo.com/pdf/10.2478/johr-2019-0004
It may still be better than nothing, since they didn't test nothing. Citric acid was better than vinegar for them, but still showed worse yield than phosphoric. I tried citric acid myself and found that its pH down effect disappeared within hours, as some combination of the plant itself and the root zone microbiota broke down the citrate:
https://old.reddit.com/r/Hydroponics/comments/q4u5wz/gh_ph_d...
The professionals generally use mineral acids, and I believe that's with good reason. Of those phosphoric is the safest to handle, though a significant corrosive hazard in concentrated form; carefully dilute to ~2% for day to day use. You could also try monopotassium phosphate, but if your water is hard then you'd need such massive amounts that the extra K and P may become problematic.