@PinkElephant
It's not so much complaining that the passcode is doing what a passcode is intended to do - it's about having an increased level of functionality *with* added security. I can't help but feel that your second to last comment is somewhat contradictory, as you say; "A little bit longer is a little bit less secure, and so on", but what is less secure than not enabling the lock function full stop - as you prescribe? Surely, enabling the lock function but delaying it, still makes it more secure than not putting a lock on at all?
The point of contention isn't whether or not to enable the lock on EN - some people (e.g. me) simply want an added layer of security on their notes over that which the innate device security offers - especially if they share their phone or others have access to it (believe it or not, this does happen). Maybe it is a factor of comfort - as you mentioned previously, but it's more of an issue of function > comfort for me.
I personally use the finger print function to unlock EN, but like others have said - it's incredibly frustrating to have to fingerprint my way back into a note that I've navigated away from for 2 seconds, when this was not the case in the legacy model.