Um, let's please not argue among ourselves. "Gentlemen, you can't fight in here! This is the War Room!"
All I meant, when I said that Terry did not "recycle plots", was exactly that. Sure, there are quite a few books about Susan having to stand in for Death, or the Witches facing dangers, or Vimes facing up to danger, or Rincewind running away.

But the point is that it's different every time.
Guards! Guards!, for instance, is very different to
Night Watch.
Mort is different to
Thief of Time. TLF is different to TLH. That's because most major characters, if the author is any good, grow and change over time - yes, even DEATH. They look at situations from a different POV.
Is it possible to compare GG-Vimes to NW-Vimes? TCOM-DEATH with Mort-DEATH?
Sourcery-Rincewind with TLH-Rincewind? (In most Rincewind books, Rincewind runs away until he can't, and then he faces the danger. In TLH, Rincewind
volunteers. I never thought I'd see him volunteer).
Also, the antagonists and the landscapes are different every time. So it's impossible to say that the plots are exactly --
exactly, mind you -- the same.
Can Wolf (from TFE) be compared with the Dragon (from G!G!), or Dragon, King of Arms (from FOC)? Can Abrim (from S) be compared with The Big Dry (from TLC)? Can
anything compare to the Creatures from the Dungeon Dimensions?
Yes, we know that the protagonist -- Vimes, Rincewind, the Witches, DEATH, Tiffany Aching -- will ultimately triumph. They always do. It would be a short book if they didn't. But they don't always do without some sort of cost, nor do they always triumph in the same way.
That is what makes the Discworld books interesting, why I keep coming back to them, and why I say that Terry doesn't recycle the same plots.