Well, if there were diseases, at least the Potion of Vitality would have some real use. I don't think Larian would implement Exhaustion, which is one of its primary functions beside boosting hp gain when using Hit Dice. Larian doesn't seem to want to challenge the player, challenge would likely be considered 'not fun' by their target audience. I mean, it's not like there's a 2nd level spell, copious scrolls, and even an amulet that would remove disease just like that.
Yeah they're underestimating players.
Not everyone wants a brainless fun romp that just involves scrambling to high ground and pushing enemies down on repeat without any considerations beyond the encounter at hand.
Resource management and diseases etc. "unfun" things make the game feel more immersive like a real adventure. But I don't think they're going to understand that. Perhaps data shows that 60% of players prefer a brainless fun romp and find challenge frustrating. Most AAA games are dumbed down like that. What happened to the Dragon Age franchise. Origins already had MMO-like cooldowns and a per-encounter design but the combat still felt tactical and party based. DA2 and Inquisition on the other hand are already completely dumbed down into a brainless button mashing MMO style mess with insane visual clutter and huge numbers flying overhead.
