Exactly. The browser provides a URL bar that is coupled to a search engine. It makes sense for the browser to provide you with a default option for that search engine. A web browser is something that needs to be on every computer; so it makes sense that the OS installs a default web browser.
What doesn't make sense is that some software (office) tampers with your preferences for a (mostly) unrelated piece of software (chrome). That is not office's responsibility.
What doesn't make sense is that some software (office) tampers with your preferences for a (mostly) unrelated piece of software (chrome). That is not office's responsibility.