I would advise against charging and discharging a battery over and over again just for the sake of not hanging it from. The degrade has three causes:
- every charge cycle degrades capacity - every cycle
- almost all rechargeable batteries do not like to be deep discharged
- charging the last 5-10% is critical, these need to be charged slowly and preferably never
A good LiPoly / LiIon charger should stop charging a battery before it reaches its full capacity - at about 90% to 95%, then the battery will last a lot longer. It should also not try to charge the battery if it has not fallen under a certain level, like at least 80% or lower. This avoids recharge cycles. This way a LiPoly battery with decent cells can last many years.
Sadly most charging logics do not do this and charge them all the time until they do not accept current anymore - which is why for some chargers it is indeed useful to not have them connected to the charger all the time because they will try to shove more and more current into battery (every time a little discharged happened).
Out current Librem laptops stop charging altogether when being left on the charger - so I would recommend letting it sit with the charger connected as long as possible and only to disconnect it when needed and then not to connect it right away, but indeed use the battery - this of course does not apply so well when you just want to carry it from one room to the next 
For the phone and for future laptops we want to have better control over this, like it was available with the tp_smapi driver on some Thinkpads where you can set thresholds for start charge, stop charge etc.
Cheers
nicole