Well, by default, the game will try to push you from 10-70 in Dragonflight content as of The War Within. There WAS limited level scaling for a time at the tail end of Legion where you still did the traditional zone to zone, expansion to expansion hop.
Now, from my understanding as someone that hasn’t freshly leveled a character in some time, you can at least go to the early zones of any expansion at any time, but you WILL eventually hit level caps intended to make you move on, as well as level minimums for some zones as the intent is to have some kind of natural leveling curve.
Speaking to Chromie however throws all that out the window. She’ll be near the Embassy in either Stormwind or Orgrimmar. Just check the map for an hourglass icon. Once you talk to her, you’ll have the following options:
- The Cataclysm (Cataclysm, also includes the classic zones with their post Shattering changes)
- Portal to Outland (The Burning Crusade)
- Fall of the Lich King (Wrath of the Lich King)
- Wilds of Pandaria (Mists of Pandaria)
- Draenor (Warlords of Draenor)
- The Legion Invasion (Legion)
- Battle for Azeroth
- Shadowlands
- Dragonflight (the current default state)
Once you’ve picked an option, this will scale the continent(s) in that entire expansion from 10-70. Some zones will still carry level minimums for the sake of story and/or natural progression similar to what it originally was, but you won’t have to deal with hitting level caps within the content of that expansion. As far as LFD searches go, you’ll specifically be in the dungeon pool for that expansion, but the game WILL expand the search to ALL expansions should the wait become excessive.
Now, with the speed of leveling nowadays? Yeah, good luck seeing all the zones of that expansion before hitting 70. Depending on the quest density of the zones in your chosen expansion, you’ll generally hit 70 no later than the third zone. The last time I did any sort of serious leveling was on an EU account I sometimes dabble with as I’ve made a couple friends that live over there. I had a mage do 10-38 in just Howling Fjord alone and only had two instances mixed in over the course of that (despite what people say, chain running instances is actually horribly inefficient if you’ve exhausted dungeon quests in a particular instance and just keep getting that one on repeat)
The overall timing on average during Dragonflight was about 12-15 hours for 1-60, and another 8-12 for 60-70. Speedrun time 1-70 on a fresh character using zero leveling exploits was somewhere around eight hours. As leveling time 60-70 was nerfed a bit just ahead of The War Within, I’d have to imagine the overall average timing of 20-27 hours still isn’t too far off, and as each level 80 character brings a 5% XP boost up to a cap of 25%, timing for TWW 1-80 is likely to actually be QUICKER than 1-70 for DF.
In short: you can get somewhat of a feel for the expansions you missed, but don’t expect it to be a way to see an entire expansion prior to hitting 70. Also, the moment you hit 71, Chromie will straight up yoink you out of whatever expansion you were running around in so the game can push you to start TWW. The game is all about getting to the level cap ASAP nowadays, and depending on how you feel about that, you might actually want to check out Classic.