All true. It is very easy to get sidetracked and begin to listen to only the gear. But when that special combination is achieved and you hear a track you know really well in a brand new way...wow.
When you have a Swiss army knife it seems like a shame to use only one blade. And with the prices for great output tubes for this thing being as low as $8-$10 in some cases...less than a pizza. Easy enough to try many combinations and settle on the one (or two) that sound best to each individual.
Erik, the 350B is not such a visual statement, it looks pretty much like a 2a3 tube, but the 6bg6 is an eye catcher. And here's a snap with the Bendix 5992 glowing purple. Nice tube, but not worth the current prices imo.