lt'll support the 1TB cards just fine more than likely. Only reason why they list a specified size is because the larger SD cards weren't commercially available. the 1TB cards are SDXC just like all of the cards the S10 works with.
Anyone needing that much space is probably planning on using DeX as a desktop replacement, either with Android or Linux. Or even a Windows port down the line.
That, or they have a lot of porn.
It's not that the display is worse on the S10e, it's that Samsung toned down it's artificial coloring and contrast and defaults to something more natural instead of the usual vivid mode. And the vivid mode is toned down compared to the S8 and S9.