Onboarding Friction with PSPs - What's the Latest Pain Point?

It feels like every other month, the goalposts for KYC/KYB shift with payment service providers. I'm curious what others are seeing as the primary bottleneck right now when integrating new PSPs, particularly for businesses dealing with higher risk sectors or cross-border. Is it still the document verification for UBOs, the interminable wait times for compliance review, or are there new twists I haven't encountered yet? We're trying to streamline our onboarding process, but the external PSP requirements remain a significant choke point.