I have the same experience, but I'm yet to decide what is worse: weak vi-mode where it collapses straight away(no count support fex), or strong support where it fools you for long enough to catch you out when you're fully in the flow.

My go-to example for strong support is emacs' evil-mode¹, it takes a lot for it to break down. For example, it even supports things like the expression register² but then requires an elisp expression.

1. https://bitbucket.org/lyro/evil/wiki/Home 2. https://vimhelp.org/insert.txt.html#i_CTRL-R_%3D

Edit: I'm pointing out where it has fallen down for me, not complaining that the devs haven't implemented a full vimscript interpreter to attach to that binding. I love evil.