CoolMusic, that's a good setup. Just to clarify, I don't use the instant transfer option in PayPal, as well. However, in Cash App, I will fund my account using a linked debit card, which is instantly available, for me. This may differ for someone else, based on their financial institution.
For cash back, I will sometimes use PayPal, when it's part of a rotating cash back quarter using a linked Chase or Discover credit card. Occasionally, American Express if there is a single offer that pops up every once in a while, such as a digital wallet.
That's good to know about the PayPal CC, that it'll redeem cash back to your PayPal balance quickly. I don't have any personal experience with the PayPal CC.