At Teradata we found that if Designers were left to work directly for PMs or directly in product teams, there were often pressured and outnumbered, or worse they were biased in their designs.
We arrived at a fun solution that ensure everything when through the proper process, rigor and testing nicknamed "R.A.D.A.R." which stood for:
Research - formative user research and interviews
Architecture - product and information architecture
Design - visual, interaction and interface design
Architecture - design system and UI platform architecture
Research - user and usability testing