I do rather enjoy thread drift and am guilty of it myself.
Also try to follow some parameters as to when it is okay and when it’s not to keep peace on the platforms.
This my interpretation:
When thread drifts are a good thing:
After the OP’s question has been answered 
Once the thread has developed roots 
When the thread drift is not preferable:
If I don’t know the OP 
Trashing professional’s personal lives 
Authentic or traditional vs unconventional or Modern 
Some of us have debated answering the OP’s question at all, on another thread, because it probably is not a good idea.
I always answer the OP’s question followed by I don’t recommend it and present my side and let the OP make the final decision.
Sometimes we don’t understand a poster’s posts and that’s okay scroll on by and come back you just might like what you see and want to join in. Just give the thread a chance to blossom.
Perhaps PM/DM the poster and explain what you don’t understand and a light bulb just might go off for them on how to explain and clarify more because others may have the same question as you do.
On the WFD thread there was a controversial off topic (that well I brought up) and I chose to create a new thread to open it up to another audience.
Also not to create havoc and chaos on “their” thread out of respect for them and everyone else.
Trashing a professional’s life is not ok if personal attacks are not allowed here. The same rule should apply to the former.
My experience with Authentic and Unconventional is it never plays out well because people are very proud of their heritage(understandably) and are easily offended. That is better left on a separate thread as to not yuck on a cooking thread’s yum.
With of course, the chain link can be added to that thread if anyone wishes to read it.
I was recently a part of something very exciting because I was shopping for a new knife. I decided to create a thread Misen vs Mercer Knives after 2 days I couldn’t believe the views. At the 5 day mark I think it was over 900 views. That was awesome to see.
From that thread @Vecchiouomo decided to create :
*How is a Home Cook Different from a Pro? Does Professional Instruction benefit a home cook?
*Knife Talk was the new topic that was separated into a new thread from Misen vs Mercer
From knife talk this thread was created:
*How Do You Stop From Tearing Up When You Cut A lot Of Onions
And someone got Excited from all the Knife discussions (there are many more) and made a comparison thread:
*My “One Knife” Recommendation
Wow to think that I was a very small part of that is extremely rewarding.
Thread drift is wonderful in the right situation.