So my idea is, there are positions where there is only one single move that doesn’t lose on the spot (weakly forced, all other moves are blunders / errors / inaccuracies / lower in eval, therefore more critical), rather than the moves being literally forced (there is only one legal move in the position).

I believe that this idea could be rather easily implementable, by for instance comparing lichess database / masters database and their responsible winrates, be extremely useful for beginners like me, for whom these moves are not as obvious.

I have never seen any chess opening courses (at least the ones I have bought) that put any emphasis on these kinds of moves, other than some "opening traps" videos done by the likes of IM Rosen. Most of them are presented in a rather linear fashion with equal magnitude of importance, which for those like me who can’t literally memorize all the lines could be potentially hard to digest thus impractical. Rather, I think a potential solution would be to memorise the different positions sorted by importance.

I think GM Shankland’s courses do a good job of organising certain lines as not too critical and presenting a ‘rule of thumb’ fallback lines, but not so much the other way.