As someone who works in the B2B SaaS space...

- If our customers vibe coded better integration points for us, it probably improves our overall value to our customers.

- The software industry, especially startups, is such an insignificant portion of the market, its not really worth worrying about. But, I can tell you from experience, that even large software companies don't want their own developers spending much time on accounting, ERP, or HRIS systems and they "outsource" this to SaaS companies.