Is it necessary to logout of SSH? -

if files being edited, know .swp can left, , history of commands not written, there serious drawbacks terminating shell rather exiting cleanly ?

from security view nothing @ all. it's question of connection. if goes wrong there can non aligned connection between client , server, in 1 think other connected in fact it's not. in case have wait timeout. know can force client exit

enter ~ .  

but server side think you'll have wait.

however normally, closing of client shell heard server.