Just my two cents, what DOS gimmicks/features from DOS would you NOT like to see in BG3?
1. Change for just the sake of it? The red FoV is intuitive and provides a tangible sense of the limits of stealth which makes it a mini-game onto itself.
2. Literally watched the gameplay demo to get a clue what you're on about. The only "clouds" there are environmental clouds which plays into Larian's interactive environments (ie. water + fire = steam). These likely come with tangible gameplay effects rather than pure cosmetics. So no.
3. The only overused surfaces is blood which should be tuned down somewhat. A kill with a fire-spell shouldn't make the enemy bleed. Then again...pre-alpha. The interactivity of surfaces allows for creative tactics and is a bonus.
4. BG1-2 had pretty large and messy inventories, doubly so when you include all the bags/pouches you could store gazillion items in. BG3 will have much less emphasis on magic items than did DOS2 for instance. But BG2 was a high-magic setting with an overabundance of strong magical items that defined the character as much as his abilities and class. Hoping for a bit of a tuned down version, but there is always support for crafting and therefore excessive inventories by a vocal minority. Personally I don't like the over-emphasis on looting and subsequent inventory management mini-game of most RPGs. You should not be penalized for not looting everything that isn't nailed down. It's tedious, not realistic and feels forced.
5. Don't understand your objection. If anything I want it more similar to DOS2. At least when it comes to individual initiative rather than the experimental party-based initiative in the demo.
6. You didn't really pay attention to the demo, did you? That jumping isn't a natural power; it's super-charged mind-flayer tadpole vaulting. The animations are still in flux, I personally liked. Feather Fall has been a staple spell of D&D for going on half a century. Morrowind did the rip-off, not the other way around.