No. They discover the cause of the problem as the thread unfolds. Then they go back and update the thread title to explain the cause, in brief. e.g. Let's say someone starts a thread with the topic....
"My 100-400 is soft".
A lengthy discussion ensues, with repeated requests for examples, tests blah blah blah. After a huge amount of time and energy has been spent to uncover the truth - maybe several pages - we get to the bottom of the problem. Causes might be.....
- the lens is faulty and needs to go for replacement/repair;
- the lens needs calibration with the body and AF microadjustment will fix it;
- the lens needs calibration with the body but needs to be sent away;
- the lens has a UV filter attached an it is harming IQ;
- the lens is being used on a tripod with IS engaged;
- the lens is being used with Mode 1 IS for panning a subject;
- the shutter speed is too slow;
- etc. etc.
Sure, in a couple of scenarios it is indeed the lens that is the problem. In several of them it has nothing to do with the lens. The problem is with the usage of the lens, or perhaps the body it is coupled to. In those cases the thread titles maligns the 100-400 and completely fails to address the actual problem. Is there really much value in leaving the thread saying "my 100-400 is soft" compared to "soft results with my 100-400 - user error - shutter speed too slow".
Now, over time, instead of seeing dozens of threads about soft lenses (insert model) or soft cameras (insert model), many being highly misleading, we might start to see a trend of useful thread titles, in which we repeatedly see useful things like "slow shutter speeds cause blur/softness" or "filters harm IQ" or "raw files need sharpening", "insufficient DOF" etc. etc.
And then people might more easily come to understand the causes of common problems, instead of getting worked up about Canon's QC or whatever disinformation is left to prevail.
Anyway, it's just an idea.