Some people will convert, some not. Just let people choose. In general, the more possibilities, the more people are happy and UE4 will be more popular. Most users, including my person, use most sounds in MP3 format in Unity and I have never experienced any problem. Also, I have never heard that any user say something against compressed formats. The users that don’t want to use such formats, just don’t use them. We have compressed and non-compressed formats in Unity and really no problem. It’s tha power of Unity that there’s a choice.