There is a pending pull request partially addressing this:
https://github.com/helix-editor/helix/pull/4204
It would be nice to have a comprehensive and convincing explanation in the documentation which sheds lights at the advantages of helix's treating lines. Maybe we vim old timers could learn something new and make a more informed decision about switching to helix.
For instance, if you press "A", you are now after the \n of the end of line, and pressing backspace will remove the \n, joining with the line below.
I tried to ask whether that peculiar behavior could be toggled off somehow, but was welcomed by a wall of extreme purism on how treating differently visible and invisible characters would break the character model of the editor...
I'm too old to entertain the argument, and will just stick back to vim. Maybe its character model is unpure, but at least it's understandable by a mere mortal like me.