Plus (and while I really dislike app stores in general), it solves the biggest security problem : the user. It prevents it tfrom installing a load of crapwares just because he or she clicks everywhere without reading.
Now, it's logical from those vendors to lock in installation on their plateform. It's theirs. They built it. Like you build a car so it's easier for you to sell your replacement pieces and control what's going to be plug to it.
Bottom line, if you don't like it, don't use windows. Or if you use windows because it has value to you, you have to play by MS rule or hack around. Like with cars.
I dislike these rules, I don't use Window as my main system. I use a system that doesn't lock me in.
If you are using Windows (or any other system locking your in), if you have been using it for the last 10 years, you knew this. You are half responsible for your situation.
Don't tell me "I have to use it because 'work|busines|whatever'". You choose to keep this work/business/whatever. It's more important to you than playing by MS rules. Well, you made a choice. You don't like it. But you did. You never fought it, you never did anything to prevent this from hapening. You had time. And solutions. This didn't happen by surprise or on one week. People warned you about this for 20 years, and provided alternatives, and you didn't use it.