Quote -  Well, P4 renderer is gone in P8, there's just firefly now, but I don't use it since P5, with the right settings you can render a draft really fast, it's just a matter of getting used to.

I just found it convenient, since it had its own tab.  You could set up the P4 renderer for quick drafts, and Firefly for a high-quality final render, and easily swap between them.  I wouldn't have to worry about forgetting to change something for the final render, like I do with Vue.  (And there are so many settings I usually do forget something.)