I suppose that you could develop a way to put RA-Dec circles on a platform mounted dob, I have never seen that done, so I can't say that I understand the possible pitfalls.

I guess my way of thinking about this approach is that there may be times when I would use the scope without the platform so the alt/az circles are useful in both settings.

Setting the platform back to level to use the circles can be a quick and simple process on the non-tangent drive platforms, so it seems like a simple solution.

Of course, one could simply get a Equatorial Mount and skin the cat that way if tracking was a requirement.