Alice said: The context of this scripture isn't crystal clear and the meaning of some Bible passages are only explained through the passage of time.
No, for the JW's they are explained wrongly, and then changed again and again, though the passage of time. They are not "explained" through the passage of time. And the passage of time should have nothing to to with the true explanation. The passage of time is only seen as relevant because JW's made the mistake or anchoring their "Generation" interpretation to a separate date they had arrived at. Time proved this to be a mistake. But they won't learn from it.
The truth is, if they didn't know - which clearly they didn't and don't - then they should have kept their mouths shut and said "We don't know what the Generation is, the context is unclear". But no, they made it part of a false "Creators Promise" linked to 1914.
Big Mistake. Repeated and repeated and repeated and repeated and repeated.....but their brand new non-contextual understanding is "evident". Wow. Isn't that exciting? I'm sure it'll be correct this time. Sixth time's a a charm!
Alice said: It's quite possible the faithful and discreet slave had the current meaning in mind but took into consideration various expectations and let time be the judge.
No, otherwise they would not have referred to a former wrong interpretation as "The Creator's Promise". Unless you believe that it's possible the GB could know full well that an interpretation may be incorrect, but decided to claim it as God's Promise anyway? That would be a problem.
Alice said: The people that deny its meaning as explained in the Watchtower...
Sorry, deny which explanation? There have been so many. This month's?
"...don't know what it means and really never did. Was it ever explained in any other books written by theologians?"
I don't know. But you're right, shame on them for not making a definite judgement when they didn't know for sure! They should take a leaf out of the Society's book and claim they do know even when they don't and make false statements as fact, which they later discard as false. Better to authoritatively talk crap than to humbly refrain from judgement, right? Actually, as is now obvious, the Society itself "doesn't know what it means and really never did", but they don't let details like that restrain them.
You said the context was unclear. The "faithful and discreet" thing to do, if you don't know because the context is not clear, is not to make unsound proclamations in God's name and to admit that you don't know.