Storing sensitive data indefinitely in variables or buffers: Whether and how to fix?

[Jens Schmidt]

This is related to

  https://lists.gnu.org/archive/html/emacs-devel/2023-05/msg00327.html

and bug#63627 I've opened to track progress.

plstore.el stores clear-text sensitive data in a number of places in a
running emacs without automatically expiring it as, for example,
password-cache does.

1. As usually, fixing these decreases convenience.  Is that OK?

2. Is fixing these considered a bug (relevant for emacs-29) even if it
   involves a bit more effort, possibly even new functions and
   variables?

Thanks.