The short answer: If you have to ask, there is a risk that a Chromebook is not for you.
The nitty gritty problem with Chromebooks is the software restriction. Most users would (at least eventually) be able to get used to the other differences and shortcomings of a Chromebook, but the software restriction problem would likely be a deal-breaker for most users. The only software that will work with a Chromebook is (a) Web-based software (e.g., Google Docs, browser-based games) and (b) software available at the Google Play Store. The odds that you will one day regret not getting a Windows or a Macintosh computer are very high. Maybe you'll get your scanner working with your Chromebook, but then you'll run into the limitation of not being able to use your favorite software to crop or otherwise fix the photos you've scanned.
I would liken a Chromebook to a higher-functioning tablet. So, you might be a candidate for a Chromebook if you accept that it will mostly be for consumption (watching movies, reading emails) as opposed to creation (creating movies, creating documents to attach to email).
If you're on the fence about getting a Chromebook, I will advise you on it for free. With just a couple of minutes on the phone, I'll be able to tell you whether you'll likely encounter problems or not.
Gentle, no-nonsense advice and perspectives on technology.