Stripe has such a critical mass, I think SAAS builders don't even shop. It's just of course you use Stripe. It's a like a utility. I think even customers might be surprised to see a non-Stripe checkout when purchasing a SAAS. Might even get worried.

I suspect most CFOs/CTOs fear the risk of undertaking a rewrite of your payment processor or merchant of record layers (which can be tricky to fully test even with sandbox/test environments) more than the percentage discount and opportunity cost of not shipping more features.

You have to read the article: 2.9 includes interchange fees, 0.6 does not. It's a really bad headline

Anyone doing high volume on Stripe is paying IC+ rates. These numbers aren't comparable as you grow.