> Thanks to Apple's exceptional software quality the app has plenty of bugs…

I use Photos for macOS daily and I've never run into a bug with my 50K+ photos library. (To be fair, Photos doesn't do that much, and I use it more as a master catalog with Aperture's spiritual successor Nitro.)

> …and good luck exporting a lot of files out of said library…

Not sure why you would need luck to copy the "Originals" folder from the library package.