I disagree that they're difficult to retain and use. I've learned how to use both sets of shortcuts, as I sometimes move between macOS, Linux (Ubuntu), and Windows. Regardless, macOS shortcuts are my favorite.
In my experience, shortcuts are more consistent on macOS than on Linux and Windows.
When I first tried macOS I thought its shortcuts were the worst thing ever. But after giving it a genuine try for a few weeks, I immediately fell in love with em.
You can find the macOS shortcuts on the Mac keyboard shortcuts [0] support page. If you're interested in more details, you can learn about the guiding principles by reading the Human Interface Guidelines Keyboard article [1].
Even if you disagree with some of their design decisions, I'd still highly recommend reading through their Human Interface Guidelines articles. It's an amazing resource.
[0] https://support.apple.com/en-us/HT201236
[1] https://developer.apple.com/macos/human-interface-guidelines...