Isn't code-challenge going to be applicable to all questions? Therefore, shouldn't we delete it and related tags?
No! Do not delete it! I did not commit to this site to practice writing as illegible code as I can to trivial problems. I committed to this site to practice coming up with practical solutions to difficult problems.
code-golf for problems where being as terse as you possibly can is the challenge. Consider using
coding-challenge where the challenge is in actually coding a solution.