I am noob,I admit it,but I dont go ape for irrational reasons when I discover some product uses under spec parts in it.
Right there is your problem. If you were actually experienced in the industry then you would know that over-speccing parts happens a lot, and
for very legitimate engineering reasons.
In my 121GW multimeter for example we are using a chip below it's rated voltage rail specification. We have the OK from the manufacturer to do this and have done extensive testing to ensure it works fine. It is most definitely
not for cost reduction reasons.
There can be many reasons to do this, too many I couldn't even explain them all, but the most likley in this case is that either:
1) There is no other part that does the job
or
2) This is best part that does the job based on a variety of specs. It's not always possible to find the best component.
And the engineering cost of evaluating all this would be oodles more than any supposed "cost saving" you are hounding on about.
For example Rigol uses under spec ADCs in their scopes,I didnt go "ooo!!! Rigol uses under spec ADCs ooOH my god WORST T&M MANUFACTURER EVER NEVER GOING TO BUY FROM THEM AGAIN OOOOOOO!"
You do realise that by Rigol doing that (and testing the parts to ensure they worked)
changed the entire low cost test and measurement industry!
I hope that in time you'll learn some respect for what's possible in engineering and the challenges faced by companies in product design. It's not all about the bottom line.
And yes yes,Keysight doesnt care about what I think,but I am not alone who is curious what part it is.
Sure we'd all love to know, but once again your industry inexperience has prevented you from knowing their would be some very legitimate reasons why a company would not say this publicly.