I enchant with vanilla enchanting table because it's cheaper and easier to do that than to use infusion enchantment. One of three things happen:
A. I get Repair II
B. I get Unbreaking
C. I get neither
Case A, I'm done. that's my tool forever.
Case B, the tool cannot carry repair. I use it until it's used up
Case C, I add repair II via infusion.
Case B is what leaves me with worn tools to do something with. Filling up a ton of essentia bottles is something. Reduce, Reuse, Recycle.
That all said, I'm on Horizons and since my OP have noticed that Artifice has ridiculously cheap piece-by-piece enchants. So my new method is to infusion enchant repair II and then fill up the item the rest of the way with a few leather and iron ingots.