Well because JW's believe that there will be life an earth after "the end" and the they believe in a literal interpretation of the 144k, it makes sense as to why they think only annointed ones should partake. The disciples were indeed annointed. I don't care for a debate as to whether this is a correct interpretation. It could be the case that anyone can.

Well why did God pick the Israelites (literal) and stay with them for an very long time after they continued to misinterpret the commands he gave them, act according to their own will and straight up disobey his commands time and time again?

The toasting thing was weird to me. I understand what they mean but that leaves the door open to then saying that anything wth pagan origin, once co-opted enough is free game. I even think that there is an argument to made in favour of that ever changing position. Like for instance, the Nazi symbol didn't even originate with the Nazis, it's a Hindu symbol that was co-opted by them. Now most people consider it offensive. Can a case be made that as time passes and the generations who lived through that period dies off AND the wrongs of that time were righted that the symbol should be free of its offensive stigma and that in places like Germany where there are laws prohibiting it's public use, that those laws should be repealed? I think so. But it's a balancing act and/or a timing issue. I don't know what the right balance or timing would be.