there is more competition among rival bir now than ever. at least in my area, a new bir opens every 6 months. The older ones will surely use all the tricks in the book to stay ahead of the competition. I seriously doubt knowledge has been lost in these old bir,s. And from memory the taste has stayed consistant over the last 20 years. The really good restaurants take much longer preparing everything, and the price reflects this. the cheaper ones offer less quality, and taste, but devote less time to their craft. Hence they dont need to charge as much