Charging through device nowadays?

I was watching some vape videos earlier,
And came across lost vape youtube channel one of the videos they showed they were charging the M200 centaurus through the device it self..
Also voopoo in the argus gt 2 manual they state to “please charge device with included cable”
So its OK to charge through devices now?
Because taking batteries in and out also wears out the socket maybe leaving them might be better?
Idk what you guys think and do?