Q:

In what way is this question off-topic? 

Bridging VLAN trunks on RouterOS
Some 4 years after being posted, this question of mine concerning 802.1q VLAN interface/trunk configuration on Mikrotik/RouterOS devices was closed as off-topic.  
Considering that the question seems very much on-topic and was upvoted, favourited and ultimately awarded the Famous Question gold badge, this had me a little surprised. 
Just to be clear, while Mikrotik is well known for their consumer grade wireless routers, this question was about their line of rack mounted, arguably carrier-grade, aggregation routers. 
I was hoping someone could help me understand exactly what places the question outside the scope of the site, how the question may be improved or which StackExchange site might be a better fit for such questions. 

A:

On the What topics can I ask about here?  page, it explains that your question must meet the requirement of "hardware that has a paid support option (enterprise/provider class products, some small business class devices)," and MikroTik does not offer that. 
There are actually several questions here about why MikroTik is off-topic.  We experienced a flood of MikroTik questions, and people were pointing to previously asked MikroTik questions as precedent, when, in fact, the previous questions should have been closed as off-topic. 
I'm not sure when the optional, paid support requirement went into place.