I tried to switch from vertico to the new built-in fido-vertical-mode a couple of times (so I was using fido+orderless). I was quite happy with its default behavior, the blocker for me was that it’s much slower than vertico (i.e. the latency between each keypress and redraw during filtering).
If someone has any tips to speed up fido-mode (except native-comp which is already on), I’d happily make the switch myself :)