Your example was an "Idea" thread (and I thought that "Idea" section got lost in the migration?).
Idea threads should not get locked, I agree.
IMHO, "Issue" threads should get locked when there is no activity after some time period. Otherwise you have the problem of people coming across an old thread, that was likely never solved because the OP vanished, and then the newbie say "me too", but my details are different.... and the water turns to mud. They are likely different issues, different causes, but that have on thing in common that seduced the "me too" post.
And, one long messy thread with multiple people with issues and multiple people offering suggestions without proper threading and quoting is just likely to get frustrating for everyone.
A new thread gets more attention and proper troubleshooting can be done.
And, I don't think the "me too" newbie has the ability to mark a thrad as solved, so it doesn't help anybody else.
EDIT: adding a link to your own thread as more ammunition for locking issue threads.
https://vox.veritas.com/t5/VOX-Feedback/Loss-of-conversation-thread-formatting/m-p/816363