Moral: If you can't pass the handshake test, don't bother testing your techniques... ?
Exactly. If you don't pass the simple handshake test (or the simple "push" test that I use because it's a tad more comprehensive) you can't do the higher-level stuff no matter how strong you are personally. Normal strength fades with age; this type of strength is considered an "investment for old age" as both Shioda and Ueshiba noted (actually, it's a famous statement).
Can I use just this type of strength singularly to win the Olympics power-lifting championship? No. If I did use this strength though, it would boost my ability overall, no doubt, but that's not the main point. And Aikido isn't built on just strength and power alone, anyway.
But anyway... now the reason for the famous Asian "dead-fish handshake" should be apparent.