I have been using this monitor for just over 3 years with macOS on an iMac and also with my business notebook (Windows 10). Never had to install a driver before. Without administration rights, this is not possible for me on the business notebook anyway.
Hub works perfectly, at least for me (connection to my notebook with a single Thunderbolt 3 cable).
If the device is to be operated at 100 Hz, the hub must be set to USB2.0 instead of USB3.2. This is done via the OSD menu using the buttons at the bottom right of the monitor. So if no USB devices with a high transfer rate are connected to the integrated hub, this is not a problem.

No

No

I was able to connect my work notebook (Dell Latitude 5420) without having to install an extra driver.