That "Thunderbolt 3" is technically a version called "Thunderbolt / USB4", in that it's basically Thunderbolt 3 but also supports USB4 rather than regular USBC (meaning 20 to 40 Gbps instead of 10 Gbps). Of course, I don't have any USB4 devices yet, but I do have a couple of Thunderbolt 3 devices that I use with my M1 MacBook Air and its "Thunderbolt / USB4" ports.
In a way, in addition to replacing the Touch Bar M2 MacBook "Pro", this M3 MacBook Pro is like the Apple Silicon equivalent to when Apple continued making the 2012 unibody 13" MacBook Pro until 2016, as an option for those that wanted more processing power than a MacBook Air but didn't want to spring for a pricier Retina MacBook Pro. It was a VERY popular model.
Plus, it was the last Mac laptop to have built-in Ethernet and FireWire ports and user-replaceable RAM, along with the last overall Mac with a built-in optical disc drive. And then when the refreshed MacBook Pros (introducing the Touch Bar) first came out in 2016 and that 2012 unibody Pro was discontinued, they continued making Retina MacBook Pros for a year as a lower-cost alternative to those new Pros.
In a way, in addition to replacing the Touch Bar M2 MacBook "Pro", this M3 MacBook Pro is like the Apple Silicon equivalent to when Apple continued making the 2012 unibody 13" MacBook Pro until 2016, as an option for those that wanted more processing power than a MacBook Air but didn't want to spring for a pricier Retina MacBook Pro. It was a VERY popular model.
Plus, it was the last Mac laptop to have built-in Ethernet and FireWire ports and user-replaceable RAM, along with the last overall Mac with a built-in optical disc drive. And then when the refreshed MacBook Pros (introducing the Touch Bar) first came out in 2016 and that 2012 unibody Pro was discontinued, they continued making Retina MacBook Pros for a year as a lower-cost alternative to those new Pros.