I used to do that a lot, especially the night before a recording session. Just as you wrote, I did it to make the head stay in tune longer, but I also did it to achieve a “round” tone. I was under the impression that this procedure was necessary in order to fully break the glue, so that it wouldn’t slip and detune on its own during a performance. But I switched to Aquarian Texture Coated heads years ago and found that I didn’t need to mess around with elaborate head seating conventions anymore. Now I just mount a new head on the shell, tune it up to my desired tension, and play. It made quick changes at gigs so much easier and effective.
Keep in mind that I can’t officially endorse any drumhead companies — I buy my gear like everybody else.