Does Bootcamp still result in a hybrid MBR/GPT situation? I am running Mojave still (if that matters, but could update to Catalina), and want to dual-boot Windows 10 for the odd occasion when i need to run a program that is windows only.. or debug something.. but crucially don't want to virtualise.

Not being a massively experienced macOS user (only switch this past year), i've read that bootcamp does some funky things with the partition table, resulting in a MBR/GPT hybrid? Is this still the case? Even though Windows 10 has been UEFI for ages now?

I was planning to simply do a UEFI boot from a USB drive with Windows 10 it, and go from there... will i struggle with drivers without Bootcamp, and is that partition still going to be available in something like parallels though?

Thanks in advance!
Based on the information in your question, Windows 10 UEFI boots on your model Mac. Most users use the Boot Camp Assistant to install Windows 10. You do not have to use the Boot Camp Assistant, however the easiest way to download the Windows Support Software (the drivers) is to use the Boot Camp Assistant. Once you have the Windows Support Software, you can install using a flash drive if you wish. 


  You can use the Boot Camp Assistant to download the Windows Support Software without actually creating a partition and installing Windows.


You will not need hybrid partitioning to run Windows 10 on your Mac. This is true whether or not you use the Boot Camp Assistant to install.