Is it unprofessional for a journal editor to be anonymous?
How should the editor's decision to stay anonymous be qualified? For
  example, was it
  
  (un)ethical,
  
  (un)professional,
  
  (contrary to the) commonly accepted practice?
  
  What does this tell us about the editor or the journal?


Or Option D: Likely the result of using editorial management software, with no particular agenda behind it.

There are many reasons why the template can be generic. For example, a purely practical one is that one editor might be handling your submission, but then hand it off to another editor if they think they've got more appropriate expertise, if they need to take leave, etc. 

One's interaction with an editor isn't particularly a personal one. They are acting in their capacity as the editorial office of X Journal. And when it comes down to it, it's the Editor-in-Chief's decision that is the final one, regardless of who you worked with, so it's entirely reasonable for the journal to speak with their "voice".

So no, it's not particularly unprofessional, and it's definitely not unethical. For that matter, it's not even a departure from common practice - likely a good half of the journals I publish (field: Biomedicine) in don't necessarily disclose what editor is assigned to your paper.