Since iOS 8 the system has had most of that functionality baked-in or is officially supported by Apple’s APIs for third-party devs. The only real things I feel I’m missing out right now on iOS 14 is raw FS access and easy sideloading.
> easy sideloading
Workaround available. [1]
Unless you jailbroke your iPhone 2G and 3G that's an impossibility: the iPhone has never officially supported USB Mass Storage mode: it has always only ever officially supported MTP/PTP (and DFU) over USB.
Sure, sometimes a 3rd party comes along and makes a great product that once it is used, it feels like it is just something that should have always been there. Apple being Apple, they are going to want full control, so if they can't acquire the tool to do what they want, you know they will develop it internally. Every tech company does this. FB/Snap/Insta/etc have all borrowed/stolen/re-implemented.