That's the general idea, Mr. Bennett. That, and the fact that the vacuum tube models put out a lot of waste heat, and even had slots (for ventilation).
And I'll also point out that even some jazz artists have found that the world doesn't begin and end with Laurens Hammond's Noisome Little Noisemaker (tm): Barbara Dennerlein, Germany's jazz Hammond queen, has recorded three "all real pipes" CDs, and a fourth that's part Hammond, part real pipes, and she now does perhaps a bit over a third of her concert appearances playing jazz on real pipes. (And she is quick to point out that Fats Waller was playing jazz on real pipes back when Hammond was still learning how to make electric clocks.)
(Oh, and BTW, it was only a few minutes ago that I realized what "BSG" was. <shrug> I always just used the title Mad Magazine's writers came up with: Cattlecar Gigantica.)