My question (link here) originally had a htc tag. Then another user edited it to remove htc and added htc-desire-x instead. I felt both the tags are relevant and added htc back. But the user again edited my post to remove htc. Before getting into a toggle edit fight, I was wondering if it's against rules to have both the tags in a question?
The manufacturer tags like htc are more of a catch-all for when there isn't a more specific tag that applies (eg for obscure/unusual/new phone models), they're not needed if there's a more specific tag that applies, so aren't normally used, unless your problem is related to everything HTC related, which is rare.
Looking at the question, your problem could well be related to the HTC Sense custom interface, home screen and widgets that HTC add onto most of their phones now, so adding htc-sense tag in addition would make sense.
It is not against the rule, though putting the two is useless (if you do a "htc" search, all
htc- tags will show up). I just think that if your problem concern only one particular device, it should have
htc-device as tag but not
htc tag should be used for problems related to all HTC in general.