Which may well be inline with Retail design decisions, but not inline with what the devs plan for Classic.
What I have done in the past, during WoW Classic and TBC Classic has been to find or create Dungeon Leveling guilds.
If you’re actively leveling, on during regular hours, advertising your guild and dungeon runs, and regularly inviting people, you should be able to form a nice community within a few days…
Keep in mind that they wanted to settle this topic before launch: