Don’t be under the impression squires are to replace blacksmiths. It is just one of their skills, not only does it offer more potent repairs but also the convenience of repairs anywhere. With the amount of logic in this thread one could go as far to compare it to dievdirbys ‘carve vakarine’ and call it useless because, why waste a piece of oak wood when you can spend 1~5 minutes walking to the nearest vakarine statue. that scenario is infinitely worse considering npc’s don’t sell wood.
I imagine if all crafting classes had a similar skill to that of dievdirby’s ‘carve attack’ to obtain their respective materials instead of being vended from class masters would be an overall fun and good solution, but it’s probably a bit late to tamper with current design choices.