Terrific post, and right on about the security.
I don't have any resource issues on Chrome on my Mini (I7/32GB), I currently have 7 (named) windows with ~60 tabs or so open across them (tabs are also pinned/grouped as needed), several extensions, etc. I'm also running in MacOS: VSCode, ST2, Sketch, Soulver, Safari (yes, two browsers

), Postman, Messages, dozens of term windows (and various servers/services running) - and also running a VM with Winders™ that's running VSStudio, MSSM, MS-SQL, IIS. As it should be apparent, I'm a developer, so that should be an additional indicator why some of us use Chrome.
Can't hear any fans, certainly not spun up, I do run mine on a nice big, ultra BB fan with the bottom plate removed, so YMMV