If you use standalone accounts, then the liability is with Stripe. With managed accounts you're collecting all this information, Stripe charges an additional .5% and financial liability switches to you if Stripe cannot debit the merchant. I'm not saying one shouldn't be responsible for it, but it is a difference.

I would argue that the .5% you are paying to use managed accounts would include some sort of "insurance" against fraudulent merchants especially since one would hope Stripe is providing platforms with a similar level of verification compared to standalone accounts.

Ideally platforms would be aware of the differences and make the best decision based on their risk tolerance and UX goals, but after spending a fair amount of time in Stripe's IRC room in the past, people just want to build something and don't always go into the deep documentation listing some of these gotchas.