People tend to forget that darkvision is only dim light, although I've been tempted to bring back "low light" vision for a lot of races. On the other hand after the first couple of levels we always had light in previous editions as well. Although I know different people's games are different, The alternate encumbrance rule works decent but you do have to enforce it.Free form works GREAT for social, but I feel like the rules in 'Exploration' are too light for that pillar to even feel like an actual part of the game and the rules that do relate to it are SO easy to ignore. Food and water? Just be an Outlander or get some Goodberry. Light? Half the races have dark vision and Produce Flame, Create Bonfire and Light are cantrips. Encumbrance? No one cares about that.
You're down to a couple of skill checks that don't really amount to much, tension wise.
At the very least, more play examples would have been nice.
On the other hand I'd probably buy a "big book of options" that included a bunch of this stuff.