As an example, please take a look at here:
http://www.santaclauschristmasletter.com

...imagine you've taken the time to order some letters (or whatever presents) ...and then, before check out, viewing the cart, you realize there are some stupid mistakes or typos in the product attribute details...

...what to do? ...delete the product(s) from cart and start everything over again... OR... just edit the simple tiny mistakes in the attributes and continue to check out?

Just my 2 cents...