Question: It seems that tags added to questions are reordered by popularity, most popular is the leftmost and least popular tag is the rightmost. It seems that this behavior has been recently 
 [changed](https://meta.stackexchange.com/questions/50794/possible-bug-in-retagging/50819#50819).

I think that the tags should be in the order question asker or editor specifies them. If I tag something as `server java` it should stay that way and not become `java server`, just because java happens to be more popular tag. Maybe `server` describes my problem more accurately than `java`, so `server` should be first. What do others think about this?

Answer: 
It seems to be a new feature, which I don't feel is a good thing.

**Tags should be in order of importance**, which the OP is best qualified to decide.

It would be nice if it was easier to order tags (click and drag) instead of having to cut-and-paste or retype them.
**Tags** exist to categorize the questions they're attached to. They're independent of each other, and may be merged, renamed, or removed without regard to their order or importance on any particular question.

**Titles** exist to introduce and summarize the questions they're attached to. Each title exists independently from all other titles, and can be edited and refined by the author or any competent editor. 

If [server](/questions/tagged/server "show questions tagged 'server'") and [java](/questions/tagged/java "show questions tagged 'java'") represent topics your question pertains to, then make sure they're included in the tags. 

If the terms "server" and "java" are both critical to understanding your problem, then make sure they're in the title. But also make sure the title is [a clear statement of your problem](https://meta.stackexchange.com/questions/10647/how-do-i-write-a-good-title). If this means wording it such that "server" comes before "java", then so be it.