If that is the way you feel, then you probably should not have any FCC licenses or transmitters.
90.407(b) references 90.417, so your point is invalid. 90.417 grants limited special privileges to Part 90 licensees, not to just anyone with a radio.
There is one little catch 22 that you are ignoring.
How do you establish communication with another Part 90 radio operator if you are not allowed to even poses a radio with anyone else’s frequency programmed in.
And ... The reason why that article only gives authority to part 90 stations to communicate with one or another…….. Is because that is the only authority the article can give. Part 90 only has jurisdiction over part 90 operations. You can’t have an article in part 90 that gives authority to part 15 and part 97 radio stations….. That would be painfully illogical.
To find rules covering non part 90 operations, and interaction among people licensed under different parts, you have to at the higher tier regulations that cover operation under all other parts.
In those rules, you will find that it is accepted that anyone in possession of any radio transmitting device that may be governed under any, all, or no parts of the FCC jurisdiction, has full “Right” to use it by any means necessary to facilitate communications that are essential to the life and safety of him or someone else.
That general provision is there in US regulations to bring them inline with international regulations that basically say the same thing.
And the second thing is… The language of that article gives the implication that communications between two part 90 licenses that is not related to life and safety would be against the rules. That would imply that two business that are licensed for the same itinerant frequency would be breaking the rules if they were to use that frequency to coordinate day to day activities between their companies. Which would be painfully illogical.