As you’ve touched upon it; Helix’ keybindings and ‘sentence-structures’ are different to those found on Vi(m).
Unless you really want vim bindings, try them out. At least Helix is based on the Kakoune editing model which is the editor I use, and I much prefer the way Kakoune works over vim, while still being close enough so that you can pick it up quickly if you already know vim and the other way around.