Fair! I don’t use it out of the box, I use it in QWERTY layout, customizing where some keys on layers are because I’m a heavy vim user and am used to movement keys being on hjkl. Those are simple command like flags if you flash with QMK on command line.
The key with Miryoku is the home row mods plus complimentary keys on layers. Mod combinations like Ctrl + Alt are trivial.
Home row mods are not a panacea, though. They take some adjustment. I’m not even 100% sold on them for a daily driver. But it’s very compelling in practice and I keep coming back to it.