Aha. That all makes perfect sense. I wouldn’t personally have so much duplication, though, and get shift & modkeys on the thumbs to make easy combos, but it’s fine if you want them elsewhere. Do you use function keys that often? I just realised I use them so much I forgot to setup a layer for them, but that at least seems like it could go on one of the pinky keys. And a rotary encoder there would make heaps of sense.
I haven’t used tomb and I don’t think I really have a usecase for this, but I respect the on-brand command aliases.