Let me explain why I said what I said.
Firstly let me say that there was absolutely no malice whatsoever and I am amazed and disappointed in the response.
Over the last few years I have spent many enjoyable hours on here believing that I was helping others and learning in the process. Often, I have searched on here and elsewhere in order to find an answer. I often have to do multiple searches and in doing so I glance at the subject (and the sub-heading) to see if its relevant to the original question. I do not read every search return as there are usually too many and, as regular users of the facility will know, the software will find everything with the keyword somewhere in it. So, to narrow it down, I use, as I say the subject matter.
If the subject changes halfway through a thread, that is not reflected in the search. In this a search for LPG would return this thread which I would not read because the subject heading does not contain "LPG." That could mean I've missed valuable info.
The same logic applies for anyone using the search facility.
If we switch topics mid-thread we might as well have one long conversation. Or have I got it completely wrong?