A couple of things I'd like to note

[Estellios]

I remember when that was a selling point of the game (back in 1.0). "Oh, your armor breaks while out fighting? Change to a DoH, or have a party member change to DoH, and let them fix your gear."

Do people use DoHs to fix gear in 2.0? Seems like the NPCs can repair everything to max. Any reason or benefit to use DoH repairs?

You save some money if you repair it yourself. Dark matter can be bought for company seals or just cheaper-priced than NPC repairs.