This will impact advanced users who want to modify their phone software ui,and want to update their phones through custom ROMs.Their custom Android skin EMUI is not everyone's favourite and custom roms can solve that by providing stock Android interface.Many considered Huawei to be one of the few developer-friendly OEMs. The bootloader unlock codes are what allow users to do things like install TWRP, use custom ROMs, and get root access. Not giving out unlock codes essentially makes the devices useless for developers.