What to do with old/new bug reports? Usability of TJC

No, I do not think so, because you originally opened this thread with a different, distinctive scope:
Usability of TJC

This is also the primary aspect discussed in this thread.

IMO this has become obsolete since TJC was switched to read-only, as its usability is and will stay very limited, until it is switched off someday (=> zero usability, content all gone!).

AFAICS “Where are the old entries from together.jolla?” is the “appropriate thread”.