Is it me or are there more posts about E300 2.5 timing chains failing than 300SDL heads cracking or 350SD/L rods bending?

What are the telltales if any of OM602 chain failure?

What is the frequency of E300 2.5 chain and/or guide replacement that keeps chain failure in check?

Why haven't I read of 190D 2.5/t timing chain failures?

Thanks,
Sixto
91 300SE
87 300SDL
83 300SD