Split spacebars are thing mostly because of layouts that won’t support a normal spacebar key. But, since most of these keyboards have user created and designed firmware, one could assign those spacebar keys to do anything.
I have a few keyboards with split spacebars where the “right” spacebar is normal; it’s just a spacebar but small. The “left” space does dual duty; tap it and it’s a spacebar, hold it down and it becomes a modifier key for a custom layer. Custom layers are used on small keyboards to make the “missing” keys available, sort of like how a phone keyboard has number layer and symbols layer.
I fully embraced this habit of split spacebars because I cannot train myself to use my left thumb to hit space for the life of me even though I’m a touch typist. Since my right thumb is the only digit hitting space, may as well get some use out of the rest of the space taken up by that spacebar.
Wouldn’t a split spacebar be two different keys that both individually can be used to type a space? This keyboard requires that both keys be pressed together to insert a space because each individual key has a different function. Given the common occurrence of spaces, that seems needlessly difficult.
This is still a split spacebar layout though, the person on reddit who built this thing even said that they just didn’t have the right sized blank keycaps. This is very normal for small keyboards since keycap sets usually are designed for regular layouts and don’t always have the right size, sculpt, and legend for weird layouts.
