Why not to have before (Laser AS meters*) hotter Pitotīs?
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When A and B and every other mfr are doing it exactly the same way, it is probably becuase there is (as yet) no other credible alternative.
Not necessarily as i am sure you know. IMHO A and B are wrong in this important design aspect.
The answer might be in your question...........Heating ~120° C, selfregulating heater, 115V AC.
How much hotter should it be? +1 or red hot, temperature just below pitot meltdown?
What about surrounding Alu. skin if it gets heated on and off?
If you're a technician so should now. Buckling in RVSM clean area? Skinfailure due increased aging?
Not only A and B are using Pitots as measuring equipment, C thru Z are using the same, in general simple but effective system, operating flawlessly 99% of the time.