For my display, I have my Apex as the primary controller for both heaters and the 2 inkbirds as the backup controllers (between the apex and the heaters). Because I have my 2 heaters on/off points staggered, heater1 is on most of the time and heater2 doesn’t turn on very often.
So I get the best of both worlds in my opinion- I get to use the power monitoring feature of the Apex to let me know if a heater fails (key), without having to have them switch on/off frequently.
Without the power monitoring feature (requires Apex to be the the primary) it would be hard to know right away that a heater has failed if you have redundancy.
I think BRS’s recommendation and logic is wrong in this case. BRS makes a fair number of sketchy recommendations and occasionally frank mistakes in their videos. They say opinion/preference like it’s a fact, and it has gotten worse as they have gained celebrity status. It worries me when I see people reference their opinions as if they are the final word. I appreciate their videos, especially the Investigates series, but I think of them more as influencers than scientists or experts.