With over 2 million apps in the App Store I have no desire to install some shady apps from the dark corners of the internet. You on your device? Be my guest.
I have had no slowdowns and I don't keep a phone for generations. I upgrade every 24 months. I have friend still using iPhone 5s, 6, 6s and they are totally fine. Wish I would say the same for Android devices, if you lucky you would probably get only 1 OS update (after 6-12 months)
I wan't to watch the video. I don't care what player is playing my video as long as it does play well. Most phone users are not tech freaks.
If these are the sort of reasons you are able to bring up then yeah, terribly locked down OS lol.