Can ask to reopen some of my questions which were closed by unclear reasons:

 - 1) https://serverfault.com/questions/168183/open-source-alternatives-to-ms-ad-features-but-installable-on-ms-windows-close

What does it "as subjective and argumentative" mean?

This is typical development problem. If I need shot-term specific feature of AD there is no point to deploy full-fledged MS AD.

I tried to reopen it having found some answers and asking for more 
https://serverfault.com/questions/170286/non-ms-free-alternatives-to-ms-ad-features-installable-on-ms-windows-for-develop
but it was closed as "exact duplicate".

How can opened vs. closed, or having only off-topic + misinformation vs. containing valid info questions be duplicate?

 - 2)https://serverfault.com/questions/168763/windows-workgroup-localsystem-vs-domain-ad-localsystem-closed

Why it is not related to "relate to system administration, servers, or professional desktop IT in some way, within the scope defined in the faq"?

 - 3) https://serverfault.com/questions/169807/how-to-better-set-up-machine-for-development-both-in-workgroup-and-windows-domain

This is typical problem of development-environment machine setup and configuration/approach