Re: Walls
"Try getting Outlook to talk carddav and caldav, and you'll see what I mean."
I think you'll find that, if Outlook won't do it, Thunderbird might, or one of various other programs. Openness doesn't always mean that the included tools do everything, but instead that if they don't, you can replace them with something that does. On Windows, you can. On Mac OS, you can. On IOS, you can't.
"As for browsers, I have seen Brave and Firefox on iOS, and I doubt they're the only ones."
They're not. There's also Chrome and the Duck Duck Go browser and Edge mobile and they all run the same engine so it's still not open. But you knew that already, saying this:
"That iOS isn't open, well, duh. That wasn't the point."
Maybe all of us are pretty stupid then, because that's what I thought your point was. You* started by saying "One of the original reasons you'd use iOS or MacOS was because it would at least interface with Open Standards so had choices and could use a back end that was Open Standards compliant (aka nothing made by Microsoft other than by accident)." Openness seemed to be somewhat important there, at least the openness of choice, which is what all of us were talking about. If your argument isn't about that, could you explain what you are talking about and why you used the term "open" twice during that argument?
"Also, it now DOES have file management (it had it before as apps, but there's now a file manager as part of the standard build), which suggests you haven't been near iOS for a while."
It didn't before and it only sort of does now. Apps that did file manager things before were doing that within their own sandboxes. Moving files into and out of apps was painful to the extent that you basically needed Dropbox to do it as they were the only service that had good integration into most apps. What is the situation now? Well, it's much better. Why? Because Apple made iCloud Drive, which is basically Dropbox. It got integrated into more apps, but not all of them. I can't use that file browser to retrieve my document from any app, only apps that support it. Going into it now (latest IOS 13), there are several apps that store files but I can't read them; I can only get those by using the mechanism built into the app, which in some cases means iTunes file sharing and in other cases means weird web server thing. There's also one app that stores files, I can read them, and I can't find anything because the app has stored each one individually using directories with random hex string IDs (presumably the developer just connected their file system to the IOS one without giving me the database the app uses to associate files with these strings). It's also tricky to open a file in another app. Sometimes, I have to use an internal app button to do it. Sometimes, I have to use the file manager to send the file to the app. This is the difference between a file system and an open one. With an open file system, I'd be able to know exactly where the file is, and the apps would as well.
MacOS is open, at least for now. It has been since NeXT days (a little ironically), and it's one of the things that drew me to it. Despite the fact that IOS has a lot of the same code running its lower levels, the fact that I can't run or change those means IOS is not open. I'm using open here to mean openness of choice, standards, etc.
*You: Technically, there are two posts by an anonymous poster. Based on the similarity in points and that they are in the same thread, I assume them to be the same person.