So why are the crafter relics.. bad.

[DiaDeem]

If you are refering to the 'Increases to quality are 1.75 times higher when the material condidition is good'

No, they'll get higher Control/Crafting/CP stats all around. Indagator is the last crafted set we'll get for Endwalker, just like the Aesthete stuff was the last set we got in Shadowbringers. I didn't finish my Skysteel tools, but just my Skysung Needle has better stats than the Aesthete's Needle, and it's not even the finished version.

Aesthete's Needle HQ (iLv 490)
Craftsmanship: +806
Control: +441
5 Materia Slots

Skysung Needle (iLv 500)
Craftsmanship: +830
Control: +455
CP: +6

Skybuilders' Needle (iLv 510) Complete Relic
Craftsmanship: +854
Control: +468
CP: +6

So not only will we get better stats for sure, we'll also get the bonus on quality steps, which the Skysteel Tools didn't have, if I remember correctly.