In reply to Rick Wiley.

I definitely agree with Rick. I now develop with debug on all the time, and that's an education. I also have been using wptest.io - that gives a huge bunch of all types of content, including bizarre edge cases.

It's a great way to avoid unpleasant surprises. Such as "oh oh, I forgot to write CSS for that form, and it looks horrendous!" Fun content like titles that are way too long, absurd numbers of flyouts, excessive dropdown menus, images that are way too big, etc. You know, the stuff that all our clients ask for. :)