Caddy's solved the problem of"Climber Kickback" Which the soft pads were notorious for allowing the frame to shift back behind the calf. Beside being uncomfortable the utility of the tool is even compromised.
The main problem with the "Caddies" least the old ones, I know from long experience, is they were fixed ridged to the frame of the climber at a hard 90 degree angle. Being so the top of the Caddie was the only part of the pad that came in contact with the shin. The bottom of the pad... not. All weight bearing and pressure is put solely on the top of the Caddy pad. Oh, the pain
The new Caddy's, I think, corrected that shin alignment problem.
Check out the foam insert pads on the old caddies, they always wore out on the top!
To remedy that problem most old Caddy users almost always used extra padding to fill in the gap to help even the pressure across the pad. Which helped, but....
Everybody's shin is little different, of course.
Believe me I tried every shin pad ever made, up to the turn of the new millennium. And even made my own.
The best I ever used, ha, were the carbon fiber geckos. Because, first of all, they're angled to conform with the contour of the shin bone, and be flexible at the same time.
Believe me those are the real Caddy's.
Other opinions may differ. And that's OK. You young'uns can suffer until you learn better.
Not withstanding new tech, and gear today. But over all you youngsters got it so easy today.