I said this last time and I'll say it again: Stripe's front-end team makes beautiful, beautiful things.
Some people do it and it annoys. But it can also be simple things like: Big screens see 2 1/2 screen wide tables across, small screens so the tables under each other. No hidden info either way, just scaled well.
I think good responsive website is the ideal end state. I do not want an app for every single thing I visit. A few important things sure. If stripe was my main activity, sure! But if I am just using it to watch my monthly sales number... rather have a good mobile website.
First time I've had any disappointment in a Stripe design. Their stuff has been solid.