It’s not strictly necessary, it’s really a QoL thing for the most part. One thing to bear in mind, however, is that we already know the realms are going to have many more people on them than the original ones did, especially at launch. Everyone trying to find a group at once is going to make advertisements fly by and much more difficult to notice.
They never said that. The concern was that it sounded like you were trying to say that because it was a possibility, they should all just be banned and they were saying no, something maybe being possible isn’t a good reason to ban it all.
I did specifically say that I understood it’s very possible that you did, in fact, play Classic and that it doesn’t really matter to me either way. My main point was that you were implying someone who definitely played vanilla that they aren’t cut out for it.
Mixed bag. LFD in theory is a decent system, but the cross realm nature of it makes it significantly more problematic than it would be otherwise. It’s also not a good fit for Classic because live has normal and heroic on LFD but mythic and mythic+, the higher difficulties with better rewards, still requires forming a group manually. There aren’t heroic or mythic dungeons in Classic, and having the highest difficulty available able to be queued for and completed with random people isn’t a good idea.
As for LFR, it’s weird. The big problems with LFR, in my opinion, are that they don’t really encourage people to actually go beyond them if they weren’t planning to anyway, and the low level of difficulty. It’s far too easy to get these powerful rewards. One exception I can think of is actually Crucible - people who weren’t willing to learn mechanics just weren’t able to get the bosses down, and that’s important. LFR, if it exists, should be a stepping stone to greater and more challenging content.
And again, you have the problem of having fully random groups of people you’ll never see again. I’d feel a lot better about it if it could team you up with people to meet so that you might be able to group up with them to go for normal and heroic.
All in all, the idea behind both systems isn’t inherently terrible. Allowing more people to access content and get their feet wet is a good thing if it builds confidence and encourages you to learn how to play well and approach the content. Their implementation was more problematic, as people can just queue for LFR entirely, be carried by a few, get decent rewards and never desire going beyond it.
That being said, neither of them have a place in Classic.