Tactician Mode in DOS2 is absolute hogwash compared to its predecessor.
There are several skill changes to many encounters and the occasional aura; but all encounters remain fundamentally the same with +50% bloat. There has only been a handful of times that I've seen the Tactician alterations be meaningful in any way, whereas most of the time they just seem to be jokes mocking you for playing the game (Vampiric Hunger Void-Maggots was a particularly offensive example).