Leo at beekeeb is awesome! I've been using this board for a few months now, and I'm going to test out a new USB-C variant he's working on for connecting the halves instead of TRRS. I use a magnetic connector for the main connection; I have been doing this for a while with most of my boards and won't look back. The layout is vanilla Miryoku which I've loved and have not missed the extra pinky column at all.
I'm honestly not sure I've noticed it all that much, but perhaps this is because I have not had experience typing on a variety of different split ergomechs. My baseline is comparing to ortholinear, and I found this to be considerably more comfortable, so I took that as a win. It's entirely plausible that there is an even more natural progression towards a better shape. That said, I think my fingers are on the longer side, so perhaps that has helped with inner thumb key reach with my hands.
Oh interesting...I don't have particularly long fingers, so maybe thats contributing to my hesitation. Thanks for the insight :-)
I just checked again today- seems like my thumb naturally rests between the TRRS cable side and middle key, in the middle. I guess that would technically mean the innermost key is harder to reach, but I never really thought about it. Always room for improvement though.