My phone (Huawei Mate 9) recently broke down the screen. The problem is that the broken pieces come off and you can already see a part of the board below. Could the phone be a total loss, if in the "hole" dirt or water comes?
Picture of the mobile phone: https://www.instagram.com/...znzqqtext1
Yes, that can happen.
Whether you have this repaired or not you have to decide for yourself, but is certainly even cheaper than a new one.
There are protective films that could hold the shards first.
These protective films prevent breakage, for the future.
Maybe that will help you: