1. it's not really "so much". Wearing nondescript clothing, paying with cash, and maybe parking across the street are measures that people who don't know what "opsec" means can figure out. I think "burner phones" are well known enough that we can presume the typical criminal knows about it.

2. the same mechanism that makes it easy to build stalking devices for, also makes it convenient to use as a lost key finder. I'm not going to attach a GPS tracker and buy a sim card for my keys/bag, but I will buy a $30 airtag.