I think you've overanalyzed this. Why would you want to bump a thread whose main topic has already been discussed?
It seems that you are missing the point. Let me get clearer here. Take a look at the subject "Bumping Rules (as applicable to Newbies).
Old members don't go on bumping old threads, I likewise do not do that.
How about a newbie who just stumbled on the post, what was discussed is not peculiar to his problem and he/she needed clarifications. What should the newbie do?
Leave the thread and come and create a new thread about same matter. Then, who should teach a newbie to do this?
I strongly stand with this quote below;
As long as the reply is still relevant, I personally won't report it. The average users who reply to old threads are those who found them via search engines (mostly new users). Maybe they found some answers from that thread and created new questions with replies to get more satisfying answers than the existing ones.
After all, replying to a topic is easier than creating a new topic.
That is on them. The date of when the thread was created is indicated for a reason, and they should know that they are about to reply to an old thread. If I can recall correctly, there is warning before you reply to an old thread.
Mostly I report those post especially in B&H.
You keep telling us what you will do, tell what a newbie should do.
There is a warning, but did the warning prohibit going on to comment? No.
The warning stated that you will only reply if it is absolutely necessary or there is a compelling reason for that. Tell me how a newbie will not think that his comment or question is not necessary.
Though it might be fine. But I sure know what genuine newbies suffer.
I don't know how you grew and escaped newbie status, but I am lamenting on their behalf because I know what I passed through.
When I discovered that bumping old threads was an offence, I resorted to creating so many topics. Some topics that I don't deem feet to be created, I'll run to the @The Pharmacist for help via dm.