GitHub is pretty smart nowadays. If you propose a series of PR on top of each other, GitHub will change the base when it the base of the second PR got merged and so on. There is sometimes the need to rebase but I have generally no problem with it. Mind that I don’t propose this workflow with teams that also have non tech members like artists because these Workflows bring too much friction. But I keep my changes as independent as possible. All running with tests to cover the added/changed code.