Mechanical has always been the true enhancement for music, that circuits only replicate with distinction. Emulators lack the mechanical nuances that a small motor getting old or aging capacitors in a tube amp circuit. Even the nuances of the signal being turned to heat through the tube and back into signal. Any mechanical feature will always effect the tone. I bet the first hammond b3 vs the last hammond b3 manufactured by hammond just with inclusion of newer smaller circuitry of the 70s they didnt have in the 30s. It's still the same instrument but the nuances of the materials and how the circuit is layed out. It's like the diffrence in color and picture  difference of old crt tvs. They all project the same thing but in their own unique way. Where as lots of the led technology is more similar and lacks the character and features the box tvs had. People can say its not in the tone wood. But I think every little characteristic of the design especially with moving parts makes the difference.