If I am to benefit from the speed of the 2 Thunderbolt (USB-C) sockets on my mbpro, do the connected devices need to be specifically Thunderbolt capable also? And if not will the data transfer speed be only as fast as the slowest device? If anyone could enlighten me I'll at least know which peripherals not to buy. Thank you. p.s. It's a basic 2017, 13" 128gb model.