It’s not happening. We don’t want it. We don’t need it. You’re asking for antiquated technology that most people don’t really need on their iPhone or iPad. Put your stuff in iCloud and get it in your Files app on iPad. You’ve been using Apple products long enough to know they do things their way and dig their heels in the ground. It’s time to be a big boy.
If they give it to you, you will suddenly realise that you always wanted it, you just didn't know what you were missing. And that it doesn't compromise security one bit. How do I know this? Because macOS has
always had it. Have you noticed all the constant reports on MacRumors about the horrible security issues occurring for Mac users due to macOS's file system and sideloading? Um, no, right.
The only reason you think this will be an issue, is because Apple tells you so. And they tell you that so that they can continue charging the 15/30% Developer Apple Tax (on gross earnings, not net, making it horrendously worse than government taxes) on every single freaking piece of software ever written for iOS/iPadOS. And they tell you this knowing full well that there isn't, and never has been, any such issues on macOS. macOS being a platform, where they can't reap the Developer Apple Tax, oh woe is poor Apple, I don't know how they even survived before the iPhone.
But but but, what about all the dev resources Apple creates for devs? Well, what do you think happens on macOS, do you think there are no free dev resources for it? Damn straight there is. The existing business model for macOS is that Apple sells the hardware, complete with OS and dev resources, and makes a tidy profit from these great machines. In return, the devs create a swathe of software, thus making the machines actually useful to customers. The customers pay Apple for the hardware and OS, and the customers pay the devs for the software that runs on it. The iPhone has been an extremely profitable product for Apple, and they double it up, by not only selling the hardware and OS, but by reaming the devs too. The extreme greed has gone too far, and the world has had enough, thus the endless flow of anti-trust cases popping up all over the world.
But but but, a company should have a right to run their business however they want. Um no, we the people own the country, not businesses. We the people vote in the government, who, create laws in our best interests (in theory, but not exactly always, unfortunately, damn corruption, aka lobbying), to balance a culture and economy that simultaneously encourages enterprise, and protects the people from danger and abuse. Thus we have a police force, an army, a court system, and corporate/environmental/employment laws. Imagine it like this: the country is the hardware, the laws are the OS, and the companies are the software that runs on it. The software must run according to the constraints of the hardware and OS. Thus companies have to run their business according to the laws of the jurisdiction, which are created, in effect, by we the people, who create them in the balance of the complexities of our best interests, both short and long term.