Fwiw — as you'll see, a couple of fins and not much fish — I have no issues with Path Finder currently. I am a long-time user, with Path Finder substituted for Finder on my desktop (currently iMac) and laptop (moving from 2013 MBP to 2019 MBA). My implementations of Path Finder are customized down to the colors of elements. Early versions of Path Finder 8 were execrable. Cocoatech's public relations were execrable. (I'm separating that from the more general "response" since unaware-to-users the company seems to have been working on repairs and solutions.) In short, Cocoatech altered Path Finder without providing enough information about the changes, and at the same time broke Path Finder while in no way reassuring users it would be fixed.
It is now fixed for me. It has gradually become error-lockup-crash-free. I now use it without holding my breath. I no longer repeat my (in-vain) search for a replacement.
I don't yet understand how to best use it — on my laptop I like to show/hide panels, and I'm not sure how to best do that in 8 {there were toolbar icons in 7}. I have adjusted to its abilities, but so gradually I can't list what I've done. (For example: I use the Sidebar less and the "Favorites bar" (?) more.) I've regularly made, I think, small adjustments to my workflows in order to get work done. I don't have a list of them.
@JMichaelTX asks the good questions 
. The paragraph above addresses — but does not answer — his question, "How have your workflows changed?" The only answer I have to "Why upgrade to 8?" is: eventually you'll have to. In this case, the old advice "Never install version "WholeNumber.0" applied strongly.
HTH.
—Kirby.