Robot precision parts often combine light-weight structures, multiple faces and tight location features. The referenced domestic article explains why stability is usually a process question, not only a machine question.
A practical RFQ should include the part function, datum surfaces, material condition, expected batch size and any features that must remain stable after anodizing or assembly.
Before quoting, engineering teams can review fixture access, tool overhang, tool-axis changes and inspection points so the machining route is realistic for small-batch production.