Important is subjective, do you consider Spanish spell checker important for your document editor? How about Arabic or Chinese? Why would you want all of that bloat installed by default? Better than whoever needs spell checker in a specific language installs that.
When you install a program Pacman lists the optional dependencies for it, just install the ones you want and that’s it.
As for daily updates you don’t need to update daily, just weekly or monthly is good enough, just because there are updates available doesn’t mean you should install them asap.