It is of importance, including a whole range of other things, the latter you constantly ignore. What you also ignore is that it is not a simple choice when there are only two imperfect options.
And like any other human being, you have to make trade offs when purchasing products. As you correctly point out, the world is full of imperfect choices. But that doesn't mean you should get to say "Well, on the whole I prefer iOS, but because I wish it behaved like Android I'm going to force Apple to open up and selfishly take away the safer option of a closed ecosystem from everyone who prefers it. I know better than the platform owner and want my cake and the ability to eat it too."
Again, this world where Apple opens up and there are no downsides at all is a fantasy. You can argue that the downsides are worth the benefits, but you can't argue they don't exist.
This statement is not based on any facts, unless you suggest iOS in itself is a leaking pot. iOS and Android do a good job on security.
Apple being safer than Android is based on tons of facts, especially for the typical user, who is not, like me and you, technically savvy. I suspect most everyone posting on MacRumors could successfully sideload and use alternate app stores without harm. However, we are a tiny percentage of Apple's user base.
In fact, iOS is inherently more secure than Android because the ecosystem is closed. This is not a debatable point. From
Kaspersky (emphasis mine):
Notably, Trojans are the most prominent mobile threats — they constitute over 95% of mobile malware. Over 98% of mobile banking attacks target Android devices, which also comes as no surprise. Android is the most popular mobile platform in the world (over 80% of the global smartphone market). Also, Android is the only popular mobile platform that allows users to side-load software.
Don't believe Kaspersky? What about
Norton?
One of the main issues with Android app security is that users can navigate to Android settings and install third-party apps—software from sources outside the official Google Play Store. These apps can bypass the Google Play Store review process, potentially posing security risks.
Have you ever seen a guide for "best iOS antivirus apps" like
this one for Android? I wonder why that is? Couldn't possibly be because a closed ecosystem significantly reduces the risk of installing malicious apps. (Before you say anything, yes I'm aware Apple doesn't allow apps to scan the way an antivirus app would need to in order to function, but that kinda proves my point about iOS being more secure).