Apple does not prioritize collaborating with Free Software projects. Their newest hardware is usually very hard for Free Software developers to get working with Linux, and thus Tails. PC hardware tends to be more open and work better with Linux.
This machine does not start from a TailsUSB stick: the Linuxkernel included in at least Tails 3.11 to 3.13.1, inclusive, does not support the hardware USB controller.
This section applies if you get the following error message, either when starting Tails or when restarting your regular Linux operating system after starting Tails.