Well, despite this being in the negative sort of connotation, mods really extend the lifespan of games. Imagine if this didn't have that, it wouldn't be as popular nor garnishing the patreon supporters that pay for this kind of stuff to be made.They're putting more work in supporting content other people create than their own content.
... this still doesn't excuse them from deviating their plans of the actual in-game content however ^^;