would be nice to know if the fourth core on Switch which is reserved for the OS can be utilized by games – when reading something from the storage into RAM this should be an OS call. And thus it could or even better should run on the fourth core.
It was rumoured that the internal Flash has 400MB/s, external a minimum of 80MB/s read bandwith. As it is flash random I/O shouldn't be that big penalty as it is on PS4/XOne.
So 3 GB is more then sufficient on the Switch as content could be read in as needed. As Xenoblade 2 and Zelda BotW has proven on the "underpowered" Wii U that internal storage usage can do wonders. And Zelda BotW on the Switch runs even fine from the cartridge.
That means that even more demanding games can/will utilize the internal storage and we will see games which many people think are impossible on the Switch.