Issues with dual-booting High Sierra and Big Sur?

I'm currently dual-booting High Sierra (HS) and Catalina on a 2014 MacBook Pro without issues. HS is my primary OS; I use Catalina for programs that will no longer run on HS (e.g., Turbo Tax). I'm thinking of upgrading the Catalina partition to Big Sur (BS). The only issue I've found in my reading is that BS must be installed in a separate container (i.e., a separate partition) from HS, not merely a separate volume in the same container.* My question is: *Are there any other issues of which I need to be aware?* *According to this reddit post, installing BS in one volume of a container will cause changes to the container as a whole, and these changes are incompatible with HS. Thus, even though HS and BS both use APFS, they need to be in separate containers. https://www.reddit.com/r/hackintosh/comments/jun2n2/beware_dont_install_big_sur_in_the_same_apfs/ Here's a post from the Apple forums by a user who installed BS in the same container as HS, and lost access to his HS installation as a result: https://discussions.apple.com/thread/252049166