Earlier quoted context omitted.
It's great for shopping. But in the US you have amazon prime. We don't.
I don't have Amazon Prime (nor am I in the US) yet use Aliexpress perfectly fine on my mobile phone without using an app. Frankly, I don't understand how the two is related at all?
While browsing, there are also popups offering the app approximately every third link I click. Some of them are telling me to install the app.
Unless the situation has changed recently, it's not perfectly fine, it is unusable on purpose.