I buy cheaper screens and notice they use just refurbished LCDs from original screens and new glass and touch.
Ive never had one come back for a faulty digitizer.
I have had some come back with the screen starting to pull from the frame. I just make sure when they come in from suppliers from now on if the screen is separated easily by just me pushing on it I apply my own epoxy to the frame. Eliminates this issue in the future.