Axios I made the decision to use UEFI and disable CSM on all my computers, and use GPT formatting on all drives in my computers, several years ago. I will not install any OS that is not fully compatible with UEFI, period. If an OS is that far behind the curve, I don't trust it not to be behind the curve in other important respects.
That sounds very dogmatic, I know. However, for the reasons explained in the article you posted, UEFI handles multi-boot, single-OS-per-disk setups more reliably than BIOS, in my opinion, and I have not had an issue with multi-boot on any of my computers since becoming hard-nosed about UEFI-only and following the single-OS-per-disk convention.