As far as I know (I´ve yet to play a 5e PA) the rules of "Difficult terrain" and "weather rules" still apply in D&D. Those are related to the use of surfaces and weather in DOS games.
https://www.dndbeyond.com/sources/basic-rules/adventuring#DifficultTerrainhttp://www.d20srd.org/srd/weather.htmEnviromental interaction is one of the signature features of Larian games. I think they surely use it, they hinted at it in some interviews. And it is ok for me. I like that system. Albeit I think they have to nerf it a little if they plan to implement the "Concentration" checks based on CON for casters(there is still that rule in D&D). A surface can really make a number on you when you try to cast a spell and in DoS it is really easy to create surfaces (especially fire). In DoS you don´t have this problem because you cannot interrupt skills or spells and you have that "armor invulnerability to debuffs" thing.
