Disconnecting is not going to do too much for you here -- if it is still in the case it still risks going puffy and blowing out the case/screen.
The reason for disconnecting anything is to avoid something called quiescent current which is current drawn from the battery to power clocks, standby LEDs and whatever else, which the Switch has minimal of really. If you had a standalone charger then that would be fine as well.
On top of that basic chemistry means self discharge will still be a thing, and likely the larger factor, so yeah stick something on the calendar to say "time to charge the switch".