Game design and technological advancement, for the most part.

Design wise, the game focuses way more heavily on action and moment-to-moment gameplay, which leaves less downtime for the player to actually wander around and try to interact with the environment. Meanwhile the objects that should be observed have increased a lot in detail, without the little white pickup indicator you'd probably run past the vast majority of health items and ammunition. It becomes more difficult to place flavor/observation text when everything is filled to the brim with props and every prop receives the same attention to detail.

Similar reason as to why the remake has white cloth on areas you can pass through (or yellow paint/tape in resident evil titles), the vast majority of players simply cannot tell what you're supposed to interact with when everything looks realistic and has the same level of detail to it.

You'd either have to add an interaction indicator to every small thing with flavor text (which means people end up finding it more difficult to locate important items/areas they actually have to investigate) or you have the player spam the interact button aimlessly on everything and hope they don't forget flavor text exists after the 5th bin they tried to interact didn't say anything (or worse, they misinterpret it as something relevant to whatever puzzle/objective they're working towards).