Just design decisions for whatever reason that decrease usability. Best example is you used to not be able to right click tasbar /task manager

Although that was backtracked and can now be done, things like that still exist, options in the right click are now an extra click away

Things like mouse cursor size and colour are now in even further apart obscure settings windows

Yes but Id reccomend 1 month or 3 from experience

Check the voltage on the stick I learnt this the hard way but some docp settings don’t apply the voltage

Your ram will say it on the sticker

Try using the powerline to another room into a router?