I don't get the appeal of a 60% size keyboard.
Faster typing in a smaller space. The smaller footprint allows all of the keys to be within the typists natural range of motion without moving the hands. Of course, portability and the footprint on the desk. And OMG the programmability. My spark adds one row of function keys beside the layout (5 keys) and one row above (4 keys). This literally has 7 layers of programmability (though most use only 4). Full sized keyboards can have different layers (my spark does), but the added keys make that less relevant and a real pain to remember (ask me how I know). But with 84 keys and those in the natural locations (rather than remembering some extra keys) make it more memorable and more importantly, more reflexive.
A couple of good threads/articles:https://geekhack.org...ex.php?topic=38882.0https://trulyergonom...omparison-differencehttps://robots.thoug...-mechanical-keyboard
I've thought about just getting a TKL (Ten-Keyless) since I stopped using brief, but I figured that if I'm going to go, I can go all the way after using that logitech. It's not considered a 60% (and it's not mechanical), but it's just about there.