It seams very clear to me "Apple has allocated this extra RAM to things like iOS Multitasking, so that the devices run faster and smoother when you're using more apps ". What's more tests have clearly shown the 6GB on that model holding more apps in RAM...
Well I interpret this as an assumption from the Developer. I have not seen any official Apple communication on this. This is what I meant.
By tests you mean real life usage examples or benchmarks? I am asking because I do not rely on benchmarks. Benchmarks tell me that the 2018 iPad Pro is faster than my laptop. Real life usage however is another story. My laptop is actually faster and more responsive for my usage. It opens files faster, it saves them faster (most probably because it does not rely on cloud storage) but does not matter. I am testing as end user - black box testing. And I care what is faster, not why.