Is it possible to get a MTD without the BF system at all ?
Sorry, somehow missed this Q.
Don’t know how much Mike himself is still building these days; but, he very definitely told me that he will build instruments without BF construction. You have to ask; and it is not his preference.
Couple other points, from my perspective.
First, the BF tuner ONLY has to be used when you are intonating the instrument. Like when you change the type of strings you are using. For that purpose, you MUST have a BF tuner; otherwise you literally will go stark raving mad trying to discriminate cHz with a standard tuner. It is a one time thing for each kind of string set. After that initial setup, standard tuners are perfectly useful.
Second, the tempered tuning result does sound more pleasing when you are chording; but, I can not discriminate any difference playing supportive bass lines in ensemble.
Third, OTOH, I’m not doing studio work, where otherwise subtle tuning aspects are scrutinized. I CAN absolutely see a pro studio player preferring this setup. One less thing to worry about.
My takeaway is that BF introduces a bit of fuss to produce an advantage that is somewhat subtle. OTOH, it isn’t all that demanding to get a $125 tuner to support a $6k bass; and not all that complicated to use it.
Confession: I kind of freaked out when I first switched string sets on my bass and didn’t have the tuner. I’ve actually got pretty decent sense of pitch and immediately recognized the problem. Didn’t realize that I absolutely needed the additional tuner. After a not terribly expensive and quick delivery from Amazon, the setup was easy peasey. You just have to get your head and ears wrapped around it.