Someone else will be able to explain better...
I had a session on a crusher fingerboard once and afterwards I had HIV. Then I went and trained on a beastmaker and my latest swab test came up clean, say no more
Regarding tendon (and other non-contractile soft-tissues like pulleys) versus muscle development. Serpico posted a link sometime back which challenged the view that tendons strengthen more slowly than muscles.
https://www.gymnasticbodies.com/forum/topic/3323-steady-state-training-cycle/Krank pointed out this site to me. Some of the guys posting are top level gymnastics coaches eg coach Sommer. As a sport we are decades behind. You might want to read their ideas on steady state strength training.