MFS
Amber color seems appropriate in the Airbus philosophy :
"The flight crew should be aware of the configuration or failure, but needs not take immediate action"
Such message could be assigned only a level 1 priority which is the lowest level of caution.
But whatever the color you like as long as the message is clearly transmitted to the crew.
It is not much about what the crew will do but more what he will not.
Overloaded ?
If such a message overloads me, maybe it’s time for me to quit the job.
I would probably be more prone to overload by simultaneous STALL and OVERSPEED warnings …
Maybe you’re not too familiar with the Airbus, but we have already a fair number of AMBER ECAM MSG that only require crew awareness nothing more.