Update:

I tried another USB cable on the usb type-a port (USB 3.2 Gen 1x1) and now I 
see:

---
$ dmesg
...
umass1 at uhub0 port 1 configuration 1 interface 0 "JMicron External" rev 
2.10/2.14 addr 6
umass1: using SCSI over Bulk-Only
scsibus5 at umass1: 2 targets, initiator 0
sd3 at scsibus5 targ 1 lun 0: <JMicron, Tech, 0214> serial.152d0578D56419883890
sd3: 1907729MB, 512 bytes/sector, 3907029168 sectors
---

---
$ usbdevs -vv
...
addr 06: 152d:0578 JMicron, External
         high speed, power 500 mA, config 1, rev 2.14, iSerial DD56419883890
         driver: umass1
---

So the device is connected in "high speed" usb 2.0 mode.
I assume this is because of the USB cable.
I don't have a USB 3.x cable with type-a connector at hand right now,
but I will try that in the coming days to hopefully get the "SuperSpeed".

Attaching the device via usb-c does not work all. 
I tried different scenarios (with a usb-c cable that came with delock 
enclosure):

- attached at boot vs hotpluged
- with and without Thunderbolt activated in BIOS

Going forward I wonder how I should manage my usb devices.
As my setup is mostly a stationary laptop and usb ports are limited,
I'm considering using a USB hub.

Here again I'm challenged with the question which model I should get that works 
well.
I assume if the hub is connected via USB type-c it would have the same problems?

Some requirements for the hub:
- should support both usb-a and usb-c type devices
- should at least support "SuperSpeed" (USB 3.2 Gen 1x1 5Gbps)
- probably: attaches via usb type-a port

And on another note. 
The different port types, standards, cables can cause quite some confusion.
How do you deal with this?

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