It doesn't, unless your life changes.
Let's say you're happily flying your Warrior on Basic Med. Then, for example, you develop a cardiac problem and need treatment. The treatment works great, your world-renowned cardiologist gives you a clean bill of health, clears you to run marathons and date 25-year-olds, etc. The FAA knows better than your own doc who treated you, though. Before they'll let you go back to flying with Basic Med, you have to jump through the FAA hoops and get an SI, and if you have some other annoyance (like sleep apnea, for instance), you'll end up needing an SI for that, too. With luck, after 12-18 months, many unneccessary tests, much unwarranted expense, and lots of anxiety, you might have a medical again. Or you might not.
With MOSAIC, you can avoid OKC medical roulette and keep right on flying your Warrior. You'll have SP limitations (one passenger max, daytime VFR only), but that might be okay for you and you might appreciate staying out of the FAA medical spin cycle.