For me, the reason is closing questions. My only question hereMy only question here has been closed as offtopic, despite the help page "What topics can I ask about here?" explicitly listing these subjects as on-topic. Naturally, I'm now inclined to ask network engineering questions on other stackexchange sites.
replaced http://networkengineering.stackexchange.com/ with https://networkengineering.stackexchange.com/
replaced http://meta.networkengineering.stackexchange.com/ with https://networkengineering.meta.stackexchange.com/