There's a big caveat to using PayPal: most marketplaces are not really supported.
From the Stripe page OP link: PayPal is available for online marketplaces using Stripe Connect. These online marketplaces include businesses such as Deliveroo and ManoMano that collect payment from customers, and later pay out to sub-accounts or service providers. PayPal isn’t available for platforms that onboard other businesses and enable them to accept payments directly, such as Shopify or Squarespace.
I'm not sure this is a huge caveat. This basically just says that if you're using a marketplace that you can plug Stripe details into to take card payments, PayPal isn't going to work. That's to be expected as that would be something the marketplace provider such as Shopify/Squarespace would need to implement.
Most marketplaces are not Shopify or Squarespace, and most customers on those few are probably already able to take PayPal payments via their marketplace where appropriate.
From the Stripe page OP link: PayPal is available for online marketplaces using Stripe Connect. These online marketplaces include businesses such as Deliveroo and ManoMano that collect payment from customers, and later pay out to sub-accounts or service providers. PayPal isn’t available for platforms that onboard other businesses and enable them to accept payments directly, such as Shopify or Squarespace.