One of the biggest reasons customers like Hera is that it stupid-proofs their drawings before they go out to contract manufacturers. And they need that protection: roughly 30% of the time, the shop botches the part badly.
There's an adjacent startup idea in here: a third-party certification agency for contract manufacturers, something that tells buyers which shops can actually be trusted with their parts.
Here's how it would work: instead of auditing paperwork like ISO or AS9100 does, the agency tests shops directly. Once a year, every shop machines a benchmark part: a deliberately hard-to-manufacture design with tight tolerances, tricky datums, difficult features. Parts get harder as you move up levels, and your certification tier reflects the hardest part you can actually produce to spec.