Good common sense advice.
But as much as I enjoy Jaco's playing and no disrespect to Jaco intended, but he did not invent the fretless bass, though he certainly popularised it and was probably the first major artist to use it consistantly . Bill Wyman converted a bass to fretless in around 1960, (I believe that prior to joining the Stones Bill played in Jazz bands.) though I don't know if he played it publicly. There were possibly others before him who tried it too and a few after him. Sorry for being pedantic.