For now we can disable advancements by editing advancements:
disabled: section. But if we want to disable them all, we should write every single advancement which are a lot.

Second option is to disable only roots by doing this:

advancements:
 disabled:
 - minecraft:story/root
 - minecraft:nether/root
 - minecraft:end/root
 - minecraft:adventure/root
 - minecraft:husbandry/root
 - minecraft:recipes/root

But in this case, we will receive a hell of a lot of errors. About 8 hundred lines of errors on every startup.

Third option is to set

advancements:
 disabled:
 - '*'

But now not a single advancement will work, even custom.

My suggestion is: can you please make this constructions works:

advancements:
 disabled:
 - 'minecraft:recipes/*'

or

advancements:
 disabled:
 - 'minecraft:*'

So we can disable advancements by packs without errors.