S-voice is not part of TW, it also isn't listed in the OP.
Multi-view is part of TW as are the air features, and smart stay.
So people think of TW as just the launcher, but TW is more than that.
You can get a different launcher if that's what you dislike about TW, I use Nova.
I wouldn't delete the pre-installed software because doing so will cause OTA updates to fail.
Though if you root and install a custom ROM you shouldn't take OTA updates anyway.