Won't this send loading times through the roof and increase RAM requirements greatly? I never use powerpoint on a phone; occasionally, I have to look at word/e

Won't this send loading times through the roof and increase RAM requirements greatly? I never use powerpoint on a phone; occasionally, I have to look at word/excel docs. How does forcing a user to keep installed things which he may not use improve his experience? That aside, I like having separate windows in my android changer-thingy for different documents. Won't this ruin that? I'm regularly switching between a word doc and an excel sheet; now, I suspect I'll have to navigate some clumsy MS menu rather than doing what I do for all my other apps.