There is no morality involved with the usage of mods, morality only gets involved in very use-case situations where they can be used in an aggressive, or antisocial setting, e.g., to harass.

That being said the preclusion or prohibition of mods is not exclusively a matter of morality, but equally a matter of compatibility, ensuring equal footing/opportunity for all players, and avoiding the undermining of the game's integrity.

Further, this, and the largest concern even with tools that have the quality of life potential is the simple fact of the matter with computer security and integrity, a lot of mods can easily contain malware, and regardless of advantageous for the overall development of the game, they should be blanketed as prohibited, even if they later incorporate these ideas.