If I have a good router table is there a need for a dado stack?
Yep what Charley said. I have an 8” Infinity Dadonator set. Works well for other stuff also like box joints, rabbets (using a sacrificial fence) etc.Dado is much faster as far as rate of removal. I tend to switch to a router or router table when doing smaller and more precision work. My dado blade set is a Freud Dial-A-Width, so fine tuning of the cut width is in 0.004" increments.
If there are a lot of cuts to make, the table saw stack dado is far more efficient. The same number of wide cuts on a hand router fixed under a table is pretty abusive on the router.Depends on wahat you want to do.
I have both but i tend to use the dado stack more.