Libreoffice/Openoffice have been doing this since quite early on (reason is that the ancestor StarOffice was designed as monolith, always loading the full suite of programs, and splitting it is probably very hard), so it seems to be an unofficial standard.
On the other hand, it's disappointing, since I remember early M$ Office version being blazing fast (but again, I suspect that there was some preloading going on).
I think you can choose to use the feature on installation. I don't know if it's on or off by default. But it is a thing that exist (with the windows installer)
On the other hand, it's disappointing, since I remember early M$ Office version being blazing fast (but again, I suspect that there was some preloading going on).