For most folks considering getting a bike fit...just try lowering your saddle about 10mm at a time and try it out. Also, having a fit by an actual person, with real experience, can look for things computer programs don't. Such as dropping your heel when pedaling really hard. Saddle height can look fine when just spinning on the trainer but things tend to go to hell when you really grind.
Steve Hogg has some nice insights on this:
https://www.stevehoggbikefitting.com...ard-can-it-be/
Tim