At first glance, it might seem that taxonomy is yet another term indicating that your job is going to be more complex for some reason or other. After all, it's perfectly reasonable to set up a website to allow blog writers to blog, forum posters to post, administrators to administer, or any other type of content producer to produce content and leave it at that. With what we have covered so far, this is all quite possible, so why does Drupal insist on adding the burden of learning about new concepts and terms?
If your site is never going to gather a substantial amount of content (perhaps it is only meant as a more static, placeholder type of site), then spending time working with taxonomies and so on is probably not going to bring much advantage—go ahead and enable whatever content types you require and let users add whatever they want.
However, the aim is not generally to remain in obscurity when creating a website, so assuming that you do want to attract a community of users, then...