I find this discussion rather fruitless. What you do depends entirely on what you have shown so far.
For some, e.g. gwnn, the auction up to 3
♠ merely shows game going values. In that case, it is obvious that you have to make some kind of slam try and pass would never, ever be an LA.
In the style that I am used to, the auction up to 3
♠ shows mild slam interest. The 1NT opener is allowed to take the initiative and force to slam if he has a suitable hand. I have written (or intended to write) that I could go either way, at MPs, using that style, and lean towards pass. That means that my opinion is that pass is an LA if NS would play that style.
It is not a good idea to start adding the votes from the proponents of each style, evaluate the numbers and state something to the effect of: "x % consider pass and y % would actually pass, there for pass is/isn't an LA.".
It is much better to just ask NS what North has shown in the auction.
If NS answer that it implies slam interest, then consider it as such and throw out all the votes of people who think that North has merely shown game going values. You will be stuck with my vote.
If NS answer that it merely shows game going values, then consider it as such and throw out all the votes of people who think that North has implied slam interest. Please discard my opinion and don't misuse it for a purpose that it wasn't intended for.
Rik
I want my opponents to leave my table with a smile on their face and without matchpoints on their score card - in that order.
The most exciting phrase to hear in science, the one that heralds the new discoveries, is not Eureka! (I found it!), but Thats funny
Isaac Asimov
The only reason God did not put "Thou shalt mind thine own business" in the Ten Commandments was that He thought that it was too obvious to need stating. - Kenberg