Don't forget, less stack on the front end could mean more weight on the front end. This is important if you're going to bomb around corners like in a crit.

A really upright setup wouldn't be good for a technical crit as you couldn't carry speed around the corners.

If you don't race, or don't fancy chasing KOMs or do really aggressive group rides...I wouldn't slam/reach out a bike.

You also have to get your training miles in on said bike, in said positions......otherwise you won't be able to hold it when you need to.