NTFS has gotten better on Linux but it’s still not there. It is still highly prone to corruption, especially for a task like proton requiring constant read, write. You might get by for a little bit, but it is highly prone to failure
Source: https://github.com/ValveSoftware/Proton/wiki/Using-a-NTFS-disk-with-Linux-and-Windows








People with dual boot are more likely to have games on NTFS and think that they can use them under Linux and not realize that just because some people get lucky with it for a while does not override the fact that the proton GitHub itself says do not use NTFS for the previously stated reasons