Hi @alexander!
I know this was mentioned a lot, and it will continue to be mentioned because it is such a fundamental need.
We simply must have a way to order posts in a custom way.
Looper provider’s Order By field has a lot of options, and it should have another one: “Meta value”.
If Meta value is selected, another field Meta Key shows up.
That’s it. If we had this, we wouldn’t have to build complex queries because Query builder was unusable due to the lack of custom sorting. Especially if we need to include/exclude multiple taxonomies and similar complexities. All this is mostly needed with custom post types.
How 'bout that? 
