Why would you use or recommend silicone for sealant? It's harder to work with, acts as a lubricant for the threads, has a relatively long cure time, is open to potentially hazardous effects on the display if the right tube isn't picked up at your local store. If any of these reasons aren't good enough, you have a cheap, readily available product made specifically for this. Use the right tool for the job, and only do it once.
Because it actually IS an excellent thread sealant LOL! It does require cure time, as I noted …. though all the thread sealant approaches lubricate the threads, so that's not unique to silicone. I do agree that there's no particular reason to use it, given the alternatives. It's a bit 'thinking outside the box' though and at least two notable equipment manufacturers use silicone as thread sealant.