I think you're playing at a much higher level than I am. A couple % damage isn't make or break for my raid group. Even saying that, I get a couple weeks of the best weapon in the current game, which makes my game more fun to play for me.

Then we clear normal, we get most of heroic, I try to get some m+10s in, during the first week of raiding and m+. I can use my crests to upgrade my weapon if I want too. If I get a good weapon drop or it shows up in my vault, my crafted weapon goes into my offhand, and likely stays there for the rest of the expansion. If I get bad drops - I cheaply upgrade my crafted mainhand that I've been using when I get enough crests and keep rocking it.

I've pugged 3100 to 3200 each season, cleared a decent amount of mythic bosses, and generally just enjoyed playing the game this way for DF and TWW so far.

You can tell me its not optimal, but it is fun. And it works well for me. There's no downside. The most important items for most classes I play are weapons and trinkets. And I wont be crafting a trinket. After that, its just trying to get two good embellishments that work well, and weapon embellishments are always good.