I turned notifications off on a couple apps that I was using and I found it very helpful. In fact, I also deleted another social media app altogether and I dont feel the need to check it. I dont have a strong fear of missing out. I do notice though that these apps do their best to try and get you back, by maybe sending emails or other types of notifications to entice you to come back.
I wonder about the methodology of the research that gave the results that they got.