For all the people wanting a walled garden; do you have the same problem on your PC (Mac or Windows) deciding what apps to install?
Adobe - Not on App Store for Mac or Windows (you have to download their own creative cloud app to install anything)
Any professional 3D app (Maya, Lightwave, Vectorworks, etc etc); these all have to be installed by downloading the installer from the respective company.
Seriously if you can't take responsibility for what gets installed on your electronic devices; then you have no business owning any.
The counterpoint to that is that I don't have as many apps installed on my PC, either because they replicate services which can be accessed via a desktop browser, or involve use cases that simply are not possible on a desktop or laptop form factor.
For example, I typically browse reddit via the safari browser on my iMac, but on my iOS devices, I am spoiled for choice when it comes to reddit apps. I have 3 banking apps from the same bank on my phone, which replicate functionality I could get from logging in to their website). I am typing this response in Safari on my Mac, but normally use tapatalk on my iOS devices.
I don't have a dozen google apps on my PC either; I use the chrome browser for that.
Likewise, prior to becoming preinstalled system features, people would download apps for even the smallest feature on their smartphones, be it turning the flash into a torchlight, or scanning documents, or simply making a fart noise.
Then there are apps for food delivery, ride-sharing and online shopping, which again, are typically handled through the desktop browser.
So as mobile users download more apps, the chances of them downloading a problematic or shady app increases as well, and so it makes sense to have a system for curating and vetting them prior. I currently have 141 apps downloaded on my iPhone. Definitely way fewer on my Mac.
Not to mention that the desktop way of doing things isn't exactly perfect either. Even for gaming, there are so many different app stores. Just having Diablo 3 on my Mac means having to download and install the Blizzard game client.
I am perfectly capable of vetting and managing my software downloads, but I am also aware that I am likely more tech-savvy than the majority of the computer user base, and I think that statements like "Seriously if you can't take responsibility for what gets installed on your electronic devices; then you have no business owning any." are selfish, short-sighted and sorely lacking in empathy.