Cinema Geekly wrote:
Why take the chance that a random ship stops by...
That wasn't really a likely possibility in TOS. While the plots of certain episodes did require the Enterprise
to sort of "go back home" to ferry ambassadors or whatnot, the basic setting of the show was on the far frontier of explored space. And space was a lot bigger and a lot less crowded in TOS than in the spinoffs. A "remote" planet actually could be remote.