@ChrisAhlund 

Hi, After disabling the mesh devices, Deco would not initialize the roaming request to this device and the device itself could still initialize roaming request on its own;

In this way, there is a large possibility that PS4 would stay connected to the Deco;

For more details, please have a look at this link:https://community.tp-link.com/en/home/stories/detail/960 

With the high priority enabled, the network data sent from PS4 would be dealt with first by Deco and could improve its network performance, especially when there are more than one devices connected ;

Thank you very much.