Connecting display on macbook pro 2013 to new mac mini , to control the mac mini by cable as wireless isnt stable

Connecting display on macbook pro 2013 to new mac mini , to control the mac mini by cable as wireless isn't stable, yes I know they are supposed to work seamlessly , but mine dont, tied bluetooth file sharing sharing folders etc etc , but thing just wont connect reliably, works a while then attempts to reconnect

Starting to have paranoia about just being forced to buy apple monitor and keyboard, by clever use of tricky software,,,

Tell me it ain't so ??