NUTS DO NOT BELONG IN BAKED GOODS EVER! (except baklava)
Brownies, cake, cookies -all are irrepairably harmed by the addition of nuts. It spoils the texture. You have this nice soft, chewy brownie you are nibbleing at then WHAM your teeth sink into a small rocklike object. Totally ruins the experience, throws you off your brownie eating stride. Cookies are worse because the nuts are the same color as the cookie dough so you can't even pick them out. Brownies at least have a color contrast to work with. They add nothing to the taste of the cookie or browning, in fact, they add a totally foreign element. It is one thing if you are eating pecan pie, nuts are obviously the objective. But chocolate chip cookies are just that - chocolate chip cookies. Not chocolate chip and bits of walnut cookies.
Fortunately I am married to a man who agrees with me on this (and it would have been a deal breaker) so I never have to worry about what my lurking in the baked goods.