Great video Bob!

I think you are making one mistake when you say that CTP is "not fully responsive".

It seems you are equating mobile first design with responsive design.

While CTP is not designed with mobile first in mind (as it shouldn't be) it is still responsive.

At some point you noted that at "1130 pixels approx." you get full view of the calendar and other elements, that's quite close to 1280x720 which is perfect for CTP and LeadsLeap and any other Traffic website, as most landing pages are designed at this or higher resolution, and usually without responsiveness in mind. That's why in my opinion CTP isn't designed with mobile first in mind and it shouldn't be.

Would it profit (no pun intended 😀) if at some places it used scalable font sizes (rem or #vw) instead of fixed sizes, absolutely.

On the topic of mobile first design, some other time.