Agreed, I've wanted something like this for a while. When they introduced Careers and Home&Garden forums it kind of helped, but whilst I'm interested in discussing the housing market, mortgages etc, a lot of the stuff in H&G isn't of interest to me. If there was a 'Personal Finance' forum, I'd probably spend a lot of time in there.
The hardware forums could do with a rejig to compress it down a bit, as mentioned Optical Storage doesn't need it's own wasteland, move it in GH and people will likely get more help. Last post was over 6 weeks ago, only 10 threads have had posts this year.
Similarly Printers has had no posts for 10 days, nearly all the threads have under ten replies.
As a rule of thumb, I'd say it's only worth having a tech subforum when you will get enough traffic from people reading threads who can help people with questions and problems. When a forum has so little content, it sort of becomes a vicious circle where nobody is posting there because nobody is reading there because nobody is posting there...
Over the years, most of the changes have been for the better - splitting out football and other sports, splitting out PC games and Console games, careers subforum these were all good moves it just took a bit of persuading to get them implemented.