The biggest problem in my mind with a carved in bass bar is that is is associated with cheap, crappy work.
+1.
Remember, kindly, that these "shops" in those days (1600's up to the late 1800's) didn't take kindly to making basses. They took up too much room in the shop, weren't as easy to sell as the smaller instruments in the string family simply because there were less bass players and the bass playing wasn't as refined as it is today, so there was less demand for any refinery. Also, the basses had three gut strings.......not alot of "refinery" to worry about.