The Sonnet Echo 21 Thunderbolt 5 SuperDock , the follow-up to the similarly named Echo 20 Thunderbolt 4 SuperDock ( review ), lets you add tons of I/O to your Mac via a single Thunderbolt cable, and brings several noteworthy improvements for those looking to upgrade or future-proof their Mac setups. Perfect for both laptops like the MacBook Pro, and desktop…