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Hey there, Sam from Moz's Help Team here! You're correct - our tool has a 90% tolerance for duplicate content, which means it will flag any content that has 90% of the same code between pages. This includes all the source code on the page and not just the viewable text. You can run your own checks for percentage similarity using this tool: http://smallseotools.com/similar-page-checker/. If we're identifying two pages as having duplicate content it's likely that Google will be running into the same issues. You can read a little more about duplicate content, and how to resolve it, on our resource page here: https://moz.com/learn/seo/duplicate-content Let us know if we can help with anything else!

As long as you keep it up to date there should only be advantages. I use a free program called GsiteCrawler which runs once a week (automated with task scheduler) so it causes me zero maintenance time and I always have an up to date list of URL's for the search engines.

My company just put up a website recently and I put speed, content, design and architecture first.  But then when I did links this past month it gave rankings a huge boost.  I still need to do on page optimization but have decided to design great landing pages first, then a blog then onsite seo last. As a warning though I would choose industry links and some general high reputation links to start.  My website domain authority doubled last month and my page authority increased 33%. I did the links myself.  I would also be very careful about others building links especially the kinds that are automated.