is it important enough to worry about.
Not to me...
If I was getting cell inbalance (which I'm not), or puffed cells (which I'm not), or cells coming down hot that use to fly cool (which I'm not), or cells that can't fly planes they used to fly (which I'm not), then I would be concerned about it.
Now there is another factor here which I should make clear....these are all cheap/inexpensive packs and not the state of the art 20C, super light packs available today and none are flown to LVC or used in applications that drive them over 120F.
I should also point out that I have not measured capacity on any of them since I bought them so I might be in for a surprise, if they start acting funny I'll run a capacity check.