I usually have a vertical split, because it is useful to be able to refer to something else (e.g. other code, docs) while I work on my main task. I'll often have a pop up with a terminal or similar than I can bring up or dismiss with Doom shortcuts. That usually lives at the bottom. Occasionally three windows side by side is useful.

I cannot imagine using the features discussed in TFA though. They don't seem to solve anything for me.