I am sorry. I am so, so sorry.
Every so often, I decide "Gosh, I'd really like to write code for some Bluetooth LE devices, but I don't really do much on mobile. Maybe things have gotten better on desktop!" So far, I have been disappointed every time. Now is no exception, but I've decided to actually write down that disappointment as a form of therapy.
This post will go over how different desktop OSes, libraries, and hardware deal with Bluetooth LE. I'm sticking to desktop here because product manufacturers assume BTLE devices will usually be used with phones. Mobile certainly isn't a solved problem either, but it's better than desktop right now.