Think in content, not in pages
Does your site have duplicate content? We bet it does. So updating content on multiple pages takes up a lot of your time. Not if you think in content, instead of pages. Furthermore you will be able to use this content througout all your landingpages to connect relevant items.
If your content comes from one single database and all parts of your web ecosystem gather it from there, you will not have duplicate content on your websites. And updating everything all at once can be done in one place.