This is the ridiculous topic. Every single year, people whine about the lack of RAM in an Apple Device and every single year, it seems to be a non-debate.
If your kitchen table is 100 Feet long but you are only feeding for 1, what is the point? Mobile operating systems have smaller memory imprint then their desktop counterparts. It's applications have smaller imprints that their desktop applications. Trying to match stats of a PC doesn't make sense.
Why would Apple put more ram than they think the average person needs? So that you can win a round of speedtest in a scenario which will only happen to about 1 out of a 100,000 person.
My Ipad pro 12.9 Gen 1 is still running strong, no issues and certainly no ram issues. Apple looks at usage models and they have obviously made the point to use reduced ram because
- It increases their margins without the need to buy extra memory which won't be used by the consumer.
- Reduces their current reduction of that component - keep in mind that all components have a wattage component and increased memory = increase consumption.
As for the 1TB with 6GB of ram.
We do not know how the 1TB is composed in the ipad. if it is single packaged device then it is unknown how the packaged flash is arranged. it could be very well to manage the buffer data as it is being written to the memory.
If you take a look, apple is not the first company to do. I don't know who was first but I clearly remember:
Samsung Note 9 only offer 8GBs of RAM for the 512GB offering while the lower densities are 6GBs of RAM. So once again, the larger package size memory density seem to require the larger RAM Requirement.