Expansions never go smoothely into each other. None of the expansions flowed into each other in any logical sense.
Vanilla had a lot of varried stories but went from fighting Ragnaros and his minions, to fighting C’thun an old god, to fighting evil dragon and his minion, to fighting a major remnant of the lich king’s forces on eastern kingdoms.
Now after that last one you might think of we beat up Kel’thuzud let’s go to northrend and beat up the lich king!
SIKE
We’re going to outland to beat up illidan and his gang.
After that NOW we go to northrend even though it has literally nothing to do with outland politics or expansions other than being another part of the Wc3 story that was left unfinished.
After northrend we have cataclysm which again has nothing to do with the plot of the previous expansion. Just deathwing randomly getting free with little to no warning. Northrend DID have an old god presence as did the cataclysm expansion but it’s not even the same old god.
After that we have MoP. So a secret continent revealed by the cataclysm that’s sort of a connection but still nothing connecting cataclysm to mop in the cata storyline.
Durring MoP we got some hints that the burning legion might be returning soon but instead of that we take a sojourn into an alternate reality version of the past for literally no (good) reason.
Then after WoD we got legion which yeah kind of connects. Both involved the burning legion as a threat and the events in WoD made us just how close and dangerous the legion threat was. WoD to Legion is oddly probably the closest connected expansion despite the radical change in setting.
After legion we had BFA which I will admit DID have some set up with the conflict between Genn and Sylvanas. Still Zandalar and Kul’tiras wasn’t particularly relevant and the 4th war wasn’t gaurenteed or anything. There was tension but the expansion could’ve easily lead to something else. Emerald dream for example which was a major part of the lore.
After BFA we get one of the stranger shifts. We go from fighting each other to the realm of the dead where the gods are robots and one of the gods is secretly behind everything that’s ever happened ever but then goes down as easy as any other raid boss. Welcome to the shadowlands.
After the shadowlands suddenly we’re back on azeroth in the dragon isles for again no apparent reason. The only dragon lore at all in shadowlands was Ysera.
Now we’re on the dragon isles. The dragonflight expansion. Based on past expansions there is unlikely to be anything related to the current lore, story, theme, locations in the next expansion.