It’s actually better to use a buffer layer so your own payment logic is platform independent, eg if stripe bans you accidentally you can easily use another payment provider
I agree it would be great in this situation but currently it only supports Stripe, and they don't mention plans of supporting any other payment platform.
That being said, this does not look to be targeted at small businesses and that problem is one that is only faced by small businesses. Small operations need to have every payment system they can get their hands on (lest one of them throw the ban hammer). A killer feature for smaller operations would be multiple payment integrations.