I mean, by that standard Linux is a walled garden, because you probably can't take all your apps and data with you to another system without significant overhea

I mean, by that standard Linux is a walled garden, because you probably can't take all your apps and data with you to another system without significant overhead. I'm no spring chicken. I've had painful migrations. I'm not interested in tools that don't have an exit. Nothing about a normal Mac setup is locked-in. I could migrate my data to Linux, I expect, with minimal hassle. I mean, I wouldn't, because I enjoy the network effects of using the Apple ecosystem, and I find MacOS more pleasing to interact with than any Linux window manager I've yet seen. But it's absolutely possible for me to leave, and simple to do so. There's no lock in.