As sweet as their hardware and ecosystem is, an open ecosystem is better for users. I'd move off if I could get most of what I enjoy within Apple ecosystem.
Something open that beats Apple's ecosystem doesn't yet exist today. But you can help it get there by being a customer and telling companies what you want. Re-creating an E2E iCloud suite doesn't seem impossible. For example Standard Notes is close to beating Notes - but it's still too complicated but with focused work on the UI it could win.
As sweet as their hardware and ecosystem is, an open ecosystem is better for users. I'd move off if I could get most of what I enjoy within Apple ecosystem.