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But I never found the built-in sounds that great, and Notion 4 seemed to work less well with third party libraries.

That's exactly where Notion 6 for Mac falls down on the job. It cannot work with 64 bit only 3rd party libraries. More and more are this way 32/64 bit is becoming a thing of the past. That Fender never fixed this is the reason for my pessimism.

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And Encore 6 suddenly is back to being possible once again. If all it can do is read my hundreds of old Encore scores and export solid Music XML versions, I’ll be happy.
Yes, me too. I decided not to wait, however.

I have found PDFtoMusic Pro to be surprisingly good with Encore pdf files. Encore 5's MusicXML cannot handle Lyrics, Expressions and most Text. That information is contained in the fonts and PDFtoMusic Pro can export it as MusicXML 3.0. It gets some things wrong, especially if an expression is too close to a text but it is far more accurate with Encore than any of the scan software I've used (PDFtoMusic Pro cannot scan).

It's available for Mac/Win/LINUX and will run in demo mode without restriction except one: It will only export the first page without a license. I know people who use their PDF engines to export single pages rather than pay the $199. I paid the two bills.

There is a non Pro version that does not export MusicXML but Encore already exports MIDI so I have no use for it.

BIAB 2024 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5