I said I didn't really want one. Can there be issues? Absolutely. In life, there will be issues. I'm taking some risk by not using one. We could debate how much risk is involved. I think the vast majority of the RV world is in my corner, and if you ask them about their EMS, you will be met with a dull glazed over stare.
There is no shortage of things that you can spend money on, to protect yourself, from perceived threats. Spend yours anyway you want.
What I know is that, those who spent the money on gizmo XYZ, will then go forth and proselytize. Just like clockwork.