One concern that Apple Mac fans have had is whether Apple's new ARM-based Macs will continue to support Intel's Thunderbolt high-speed I/O tech. In statement provided to The Verge, Apple has confirmed that it will continue to support Thunderbolt despite its forthcoming transition from Intel to 'Apple silicon'.
https://www.notebookcheck.net/Thunderbolt-support-will-come-to-ARM-Macs-says-Apple.480808.0.html