Not to dismiss opposing opinions outright at all, but as you said it's very clear Rangers are not the thematic focus of Blood Elves. For others to fight on this point is when you can tell at that point they aren't thinking logically at what is present in-game now vs what was introduced before. Plus from the beginning of Blood Elf involvement in WoW their magocracy and paladin themes were at the forefront of it all.
Hmm, you bring up a good point. Could it be this is why we see more about Dark Rangers than still living Farstriders, because the majority of Farstriders from before are now Dark Rangers? Never thought about it that way.
On your last point, don't sweat it. WoW has a plethora of things that aren't used yet. Doesn't mean they won't ever be used, but as I am now doing: better to enjoy the game for what it is now than trying to feverently hope for things that may or may not come. For instance, I still hope for Alliance High Elves one day, but for now I'll continue enjoying what I already do from the game.