Lack of roms? topic

Is there any reason for the lack of stock style roms available for the Z3? I'm contemplating swapping with a friend and I currently have the Z2 and would like the Z3. Now that root on an locked bootloader is available, I've been having a look at some roms but there doesn't seem to be any? Any reason behind this? I'm presuming the Z3 is the same as the Z2 in the sense that I couldn't flash anything but the Sony stock style roms? Like I couldn't install CM12 on a locked bl?

Thanks

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