However, its presence also means that any USB 3.1 Type C port is stuck at USB 3.0's maximum speed of 5Gbps. USDM Sonic 8 GB USB 3.0 Drive. The program recorded a 33.2 MB/sec read speed and a 12.3 MB/sec write speed, which is a pretty substantial increase over our 2.0 drive in the same port That means read speeds were 51 faster and write speeds were 50 faster with the USDM Sonic USB 3.0 drive Test 4: USB 3.0 Drive in a USB 3.0 Port.
So consider an adapter to go towards the direction you desire. You can not get so much performance out of a built-in usb3 but you can out of TB 2. You are right.USB 3 and thunderbolt 2.and you're wanting to take advantage of usb3.2 gen2. I realize you may not want to use the internal disk to play games or video editing. Your internal disk is fast on this model of MacBook Pro.
You are going to see the increased performance and your limits will be, to start with the TB2 port and its bandwidth on the MacBook. The ports you gain depends on what dock or what adapter you buy. My point here is that start using the TB2 interface on MacBook.and not only one cable along with MagSafe 2 charge and you have ports galore to play with including a USB c (3.2 gen2 10gbps ).