Mister noob questions

Hi, i'm hoping to get into Mister and have a few questions before I buy in.

Firstly, for SNAC controller adaptors, are the in-between adaptors truly necessary? this video on youtube shows someone plugging the controller adaptor straight into the IO board without the adaptor and it seems to be working fine, a comment section chain there also seems to replicate these results. https://www.youtube.com/watch?v=_wPv5bljgfs&t=165s

Secondly, Is it possible to get away without using a USB hub? My current plan is to use a standard USB to micro USB adaptor for my keyboard to set up, then simply using a wired dualsense controller. I intend on using ethernet for the set up so I wont need a wifi or bluetooth dongle either.

Lastly, is the 8gb sd card included enough? I only intend on having a handful of GBA and SNES games to start with. If I wanted to upgrade SD cards in the future is it simple to copy everything over to a new card? Or perhaps I could just add a new card in the IO board slot?

Thank you!! :)