It does seem that some of the ZL enthusiasts can be a bit on the zealous side, but that's not really a ZL-specific thing, more that there seem to be quite a few ZL enthusiasts around, and also a seemingly constant supply of different models for people to start threads on.
I suppose in an ideal world, forum software would allow thread hiding based on words in a thread title (or metadata attached to a thread), or even reader-definable subforums based on something similar, so things people are particularly interested in (or not interested in) could be collected together to keep them easily accessible or out of the way.
But in the existing system, and in what is likely to exist for the foreseeable future, trying to create specific subforums does run into the issue mentioned above - at what point does a thread get declared to be too specific for the general forum, how much moderator effort ends up being expended on moving threads or making judgements, etc?
And if even just one or two over-keen people got the idea that ZLs were being 'hidden away', might they take it upon themselves to make a point of promoting them more heavily than currently happens in more general headlamp threads?