What they really know is that they are old, broken down, out of shape Baby Boomers in ever advancing states of terminal decrepitude and can't physically deal with the size and weight of FF gear. (FWIW, I'm 66 and just about dead center in the BB age range. Most of my photography is done while traveling by motorcycle, and there isn't much room for camera gear. µ4/3 cameras with current 20MP sensors provide enough data to make good sized prints, that get framed and hung on walls. Digital photography is way more technically complicated than it looks, and that's why Apple has 600 engineers working on their phone cameras. They mostly come up with very good software to make their phones digital Instamatics. I've also noticed that 1/4 to 1/3 of the posts in the Olympus and Panasonic sub-forums are in the, I don't know how to work my camera category. I don't know if this is due to the features and capabilities too convoluted/useless, poor menu structures, or all the manuals being written in Erdu.With Olympus, there appears to be many former full frame users who make the switch to M-4-3, so I infer they know their stuff.