Wow, can I ask which Android version/HTC phone you're using? I kept my HTC Incredible from 3~4 years ago rooted for development and sometimes as a music player in the gym. All of my apps still function. That said, I don't use it everyday nor as a phone so the issues may just be non-obvious to me.
I had the same experience with my Incredible 1. It was wonderful for about 6 months until it became absolutely unusable. Random bugs all over the place. Updates not coming in. So much lagginess in the UI that the interface became basically unusable.