I will say that I think the secondary questchains in Shadowlands are a thousand thousand times better than the godawful ones from Battle for Azeroth. Even the ones in SL that aren't super interesting beat out anything say, for example, was in Vol'dun.
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I've done literally all the BfA ones and I cannot remember that questline lol. Which I think goes to my point.
I've only ever done the Shadowlands one once and I just can't remember much from the side-quests or main quests. Did BfA's maybe 1-3 times at most. I usually don't remember the extra quests.