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So far every big boss fight i have seen in the world for these dynamic events have stood in one place, not moving from their spawn location once. The dragons will fly up in the air for a few seconds and then just land on the ground in the same exact place...
So whats so different from wow here? i see danger spots on the ground, i see adds spawning from either portals or out of water, a few abilities that appear to be on timers that require the player to react somwhat quickly, some positioning AOEs and 20 people standing around 1 giant mob repeatedly attacking it not actually doing anything to it other than widdling down an hp bar.
Obviously it all looks alot better (10 years later it better) than wow but thats not what im getting at. Simply put it appears that though Anet has stated there going away from traditional mmo models it appears that boss fights havnt changed one bit.
Examples of 3 boss fights