Back in vanilla WoW we began dungeons with 40-person groups often within our guilds but sometimes later on, not. Sometimes these new dungeons took several days to complete but they were fun and showed comradery. I can never remember one time anyone being told they could not come nor they did not have the experience. Players welcomed all and we learned the new, more difficult content together. Personally, I have no inclination to do content where groups would act that way so it's fine but IMO, it could be TOS problematic for those that are being treated badly while trying to explore new content. Things are not the same in these games, this one is one of the worst for friendly difficult content running. "Man's inhumanity against man" but it wasn't always this way.