I think Bethesda went a little too far in how they removed spells. I think the fact magic was overhauled is likely related to it, since they need to create new animations for each spell, but they have gone to far with what they have not included in my opinion.
I'm not that far into the game yet and I was hoping that feather, night-eye and others were somewhere else in the game. Hopefully some dlc will add in the extra effects, otherwise, its the tes nexus for me! Although its funny how there's really no explanation for removing so many spells from the game other than avoiding the super mages. Of course, that was really based on the character you played. No chameleon eh? I guess muffle kind of does the same thing, but still...
They kind of explain that Nords aren't really into magic, but still, no chameleon...
Feather and Night-eye effects are still in the game, they just aren't spells. Night-eye is just a racial power these days, A few things have the "carry weight" increase, you can get it from the steed stone, you can enchant it, I believe some potions can give the effect and there is a perk in the pick pocket tree that gives a carry weight increase as well.
Chameleon was too broken, casting up 110% chameleon (due to the 95% spell efficiency) meant constant sneak attacks, the only problem is Shadow Warrior perk is now just as broken as the chameleon spell was and you don't need magicka to use it... add on the potential 30x sneak attack damage and presto! the game is in fact even more broken and looks somewhat like assassin's creed when doing constant hidden knife counters attack, which are insta-kills of course.