I actually think a lot of people cared enough to do this; the entire Wine project sort of exists specifically because people want Windows software on Linux.
I know multiple people who have said that they won't use Linux specifically because it doesn't have the full-fat desktop version Office on there.
"Unnecessary"? Sure, I guess, I don't like MS Office and I don't use it, but a lot of people seem to really like it, whether or not they should.