i think its just a matter of not enough time and poor planning
its like blizzard has allot of nice ideas but either want to rush them ( look at n zoth who could have had his own expension rather then a patch addition )
or they want to many things at once ( like bfa were the faction conflict got drown in the zanadalari and kultiras story lines or legion were we helped more the locals then actually fighting the legion)
i literally think blizzard had some ideas for shadowlands but needed a plot tread and wanted to end bfa with a faction conflict that the expansion was suppose about and the night els were merely the sacrifice for that but didn’t looked more behind that and what it did to the night elf community.
using real life logic here like " but how do you feel if your family get murderd etc" is not going to work since wow story world is on lose treads as it is and hold together by plot armor.
they have this amassing idea for this cherry cake but only present the cherry which could be cause by pressure of shareholders and such to release on time plush the current situation with the employers rights and the abuse going on probably doesn’t help either.
atm it seem they focus on what can bring them the most cash the quickest and if a story is good enough then its ready to go and they wont worry on minor details that only impact those who are infested into the story ( which i find sad myself to as i love a good world building)
take for example my current race the vulpera and how much controversy it brought when it got released .
i really love the vulpera and made me sad there was so much hate towards it at the beginning but i cannot blame the haters since they never had any good buildup or backstory lore to begin with and like void elfs were just put in as a easy way to cash in on the feelings of those who like them ( myself included) but if there was more lore around them maby like something with the wild god fox from the war of the ancient i think the controversy was allot more toned down .
to conclude i think the story so far has already written out and i fear that we will just " move on " after this ( specially with sylvanass soul restored and the way there going with that) its best to maby take the story a tad less serious to preserve your own sanity