Dogfooding can often be a good thing but not if your target customer is a very different type of business than your own.

For example, Stripe is a _very_ large company but their product is geared mostly towards small and medium size businesses.

It's very possible that in the process of making Stripe Billing work for Stripe, they'd make it work less well for their actual customers.

It's the same reason why Intuit probably doesn't use QuickBooks to do their accounting.