I am almost reluctant to respond to this because of the flack, flaming, etc, I potentially see coming my way, but...
And then you followed with a pretty logical explanation. No call for flaming there. Besides,
dbell in previous posts you've stated that you just love to study things and pursue them until you get an advanced degree, be it a BB or a PhD. Moreover, the arts you study strike me as all quite compatible, that is similar, or at least complementary. Judo and Aikido-somewhat similar: Japanese, focusing on grappling and locks, and also: Tang Soo Do and Hakido, --Korean with Japanese influence, focusing on kicking and striking, with some aikijujutsu-like grappling. And then Kendo. Basically all five having similar Japanese and Korean roots an addressing three complementary areas: grappling/throwing/locking, kicking/striking, and swordsmanship. Its a handful, but for a life long martial-artist like yourself, not at all an unreasonable combination.
What is hard to accept is the claim by fairly young people still in their twenties, thirties, and even forties, of having mastered half a dozen complex styles that are fundamentally
contradictory in their approach. Even if a person did have the intellect, "kinesthetic intelligence" and memory to actually assimilate so much,
how much use could it be? If you learn systems that practice diametrically opposed solutions to combat scenarios, how can you ever develop a reliable "muscle-memory, or set of instincts to fall back on under stress?
If, for example you spend the necessary years to perfect a "soft", yielding system that never blocks but rather yields, absorbs, and deflects oncoming strikes (like the branch of Ving Tsun I train) you certainly wouldn't want to simultaneously train something very "hard", like Shotokan. Both work individually...
but not combined! Those of us who train in more than one art have to be very careful which arts we select. If one art calls for you to do the exact
opposite of the other, better not to train both!