That's pretty much it in a nutshell. I've got little to no radio theory in my head at all, so you've got the advantage of having a more technical explanation

Don't get the wrong idea that single conversion is a "bad thing." It's not, in and of itself. A properly designed single-conversion receiver, like the Berg brand, and most of JR's, are just as sensitive and just as resistant to noise/interference as any dual-conversion receiver on the market. Low-end park flyer receivers like the Hitec Feather and GWS Pico/Naro are more prone to glitching because they were made to be inexpensive, not because they're single-conversion.