I have no idea what reference you’re referring to or who the people are that you’ve discussed this with, but FTM is #2…by definition. That’s what ‘full time’ means – you can turn the ring and adjust the focus at any time, including during servo focusing. I've never heard the term you used, "Full time manual
override focus," before...probably because it's redundant.
Note there is a difference between Lens Electronic MF and Electronic
Full-
Time
MF. Most of my RF lenses have a dedicated AF/MF switch that sets the lens/camera to manual focus only. An "MF" indicator appears in the viewfinder, and the AF-ON button (which is how I autofocus the camera) does nothing. That's manual focus (MF), not full time manual focus (FTM).
Here’s how
Canon describes FTM:
“
When set to [Enabled], you can manually adjust the focus at any time with a specific lens mounted while the camera is on (including while Servo AF is active).”
Perhaps you need to enable the setting properly – it needs to be set to ‘Enable (actual size)’, the other settings restrict MF to One Shot not Servo. Also, note that the R, RP, R50 and R100 are absent from the list of FTM lenses so probably it’s not supported on those cameras. Also, the only lens you mention that supports FTM is the 16/2.8 (the 50/1.8 and 24-105/4-7.1 do not).
I keep my R1 set to Enable (actual size), I just tried with the RF 24-105/2.8L Z that was on the camera and with servo focusing active (blue box in EVF), turning the focus ring shifted the focus. I also swapped on the RF 28/2.8 (which lacks a dedicated focus ring), and with the lens switch set to AF the FTM function behaves as expected, turning the lens ring changes the focus while servo focusing is active.