To cut a long story short: I could not find out on the Fujitsu web site whether the current ScanSnap Home software for the Mac supports your Scanner. The ScanSnap-Manager SW can not be used on Catalina. So I assume it can use the current ScanSnap Home, even when your scanner was discontinued in 2017.
The secrets of running a ScanSnap with Catalina and ScanSnapHome are these:
After you installed the software on the Mac, make sure it gets all access right in the Catalina settings, Privacy & Security. Check each category in the Privacy tab, and wherever you find ScanSnap, check it. Make sure it saves the settings by unlocking the lock before, and relook it after.
Then you need to open the ScanSnapHome application, and connect the scanner to your computer. There is an assistant to do so via USB cable, and it will set up the WiFi connection as well.
When the scanner is operational, open the scanning window. In the scanning window (at my Mac it is in the Macs menu bar, to the right, and sometimes hardly visible because it is grayed out when the scanner is off) you can choose, edit and create Profiles. Set up profiles to fit your scanning jobs. I have created 3 of them that load directly into Evernote (among others), one for simplex (one-sided), one for duplex (front and rear) and one for high resolution. You need to give them access rights to save into your EN account. When you want to scan into EN, choose the right profile for the job before scanning.
There are a lot of options hidden in the tabs of the profiles, so take your time to look through them, and pick the right options. One of them is the OCR for pdfs („make pdf readable“). When you choose this, the OCR will be done on the Mac and saved with the pdf, not by EN on the server and saved in the note. The options for Auto-rotating pages, check and delete empty pages and create titles from content are there as well.
And I agree: Compared with a good scanner (I am using the ix500) a multifunction-printer as a Scanner can be a real PITA. My MuFu-Printer just serves as a backup. If I have only a few pages to scan, I mostly use my iPhone.