Epic, I liked the contrast in security/software approaches your desktop configuration has to your
light as an arrow laptop, and how each are specialized to do what they do in very different ways.
Although I have not personally experienced Emsisoft and Appguard on our home systems, I must say after reading the many positive testimonials, comments, and descriptions, here on MT, my guess would be if Windows Firewall is in fact not being used, perhaps there might be firewall protection included in the Emsisoft Internet Security Pack or thereabouts.
Whichever holds up the firewall's job description, I'm quite impressed with both your systems' configurations, and appreciate your sharing!