The publishing of these types studies always concerns me. Those in the public with lower critical thinking skills and agendas against women freely controlling their own family planning see them as evidence for their arguments, and they will leverage them if they can to force politicians to write and pass laws/regulations that don’t completely have bearing in facts.
I think it was to make sure that there was a clean break of the data from the timeline just in case Control had hidden some part of itself somewhere. That way the data was in no danger of being found while efforts were made in present time to ensure there would never be a “Control” again. Georgiou said she leaves as little to chance as she can (I’m paraphrasing a bit there). Notice she didn’t say Control was “dead” or “gone”, she said “neutralized.” By still flinging Discovery far into the future, I’m guessing Pike and Saru felt the same - this was too important to leave to chance, they had to be sure.