I won't really answer this meta question, rather I'll add couple observations, I hope they'll be helpful:

• Answering old questions is sometimes an adventure, the OP is in most cases completely uninterested in the problem, and often is not disponsible. Still, it is an important way of contributing so +1 to both of you.

• There is nothing wrong with providing an answer that is applicable in a slightly different context than what OP wanted (in this case, LyX or not), maybe the notice about this can be written nicer, but that brings us to English instead of typesetting.

• Being nice is a rule of thumb here. Posting a comment saying "There is no ... . Please update." to someone who obviously spent a good lot of time on the answer, this cannot bring anything good.

• IMHO, none of the answers is worth down-voting since they are both quite top-level.

I won't really answer this meta question, rather I'll add couple observations, I hope they'll be helpful:

• Answering old questions is sometimes an adventure, the OP is in most cases completely uninterested in the problem, and often is not disponsible. Still, it is an important way of contributing so +1 to both of you.

• There is nothing wrong with providing an answer that is applicable in a slightly different context than what OP wanted (in this case, LyX or not), maybe the notice about this can be written nicer, but that brings us to English instead of typesetting.

• Being nice is a basic rule here. Posting a comment saying "There is no ... . Please update." to someone who obviously spent a good lot of time on the answer, this cannot bring anything good.

• IMHO, none of the answers is worth down-voting since they are both quite top-level.