The fact is diablo 4 not have the content to run even like a Diablo, an arpg.
So this stealth nerfs to basic materials and gold are the only way to Blizzard to keep some players players.
The better solution is to give to diablo 4 a good endgame and itemization, but months are passed and Blizzard have not found a solution, so probably is impossble, so they started to stealth nerfs basic materials/gold.