There is a gray area between Software Engineering & Code Review regarding design reviews.

Code Review's on-topic page explicitly calls out design reviews as off-topic.

However, if your question is not about a particular piece of code and instead is a generally applicable question about …

• Higher-level architecture and design of software systems

From our on-topic page:

Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. If you have a question about...

• requirements, architecture, and design

It would appear that a design review is on-topic.

But it fails the applicability to programmers in general test, as a design review is essentially too localized.

Please make sure your question uniquely applies to programmers in general

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Why do I ask?

Is this proper OO design for C++?

Was recently asked, and in the body of the question it was stated:

From what I've read, design review is on-topic for this site (and off-topic for the Code Review site).

So I'm opening it up here in Meta so we can hash out whether or not design review questions are on-topic for the site.