Welcome to WoW!
Yes, I think that was a mistake - for most people, at least.
It’s not just about missing the story. It’s about not learning all the things the game teaches you along the way: geography, vendors, bags, travel, UI and addons and macros, XP, trade, communication, buffs, passives, roles. And trhen the systems you sign up for at max level are a bit elaborate anyhow, but when you have no grounding in the game before it, they really seem pointlessly complicated.
Instant boosts to 110 can be great for people returning to the game after years, or existing players who want another character, but not usually productive for beginners.
If you have played a lot of another MMO like FFXIV before, you will already have a lot of the concepts, and can likely struggle through translating your existing knowledge, but if you are new to MMOs, it’s very tough. Many people struggle with it and give up and start again from level 1.
However, that doesn’t make your 110 useless. Most players keep several characters of different classes, races. You can make a new level 1 of another class, and play that mostly for now, while taking your 110 for a cautious spin now and again as well.
Death Knight and Demon Hunter are in their own “worlds” when the start, but after playing through their origin stories, they are let out into the main world to join everyone else. DK plays separately from level 55-58, and DH from level 98-100. Again, those classes are meant for people who have already played through at least that far.