my guess is that this is reference to the limit on the number of transaction inputs. so if your wallet has a lot of seperate transactions received, or 'coins', you may not be able to send the full value all at once.
the same is true for Bitcoin, but it is much less likely that you'd have enough inputs for it to matter, as transaction costs are much higher, so most users send larger amounts, so fewer 'coins' to be managed.
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