Rykon
Five Thousand Club
Hmmm... if you think of motes like a resource, or currency... Then attuning an artifact is like moving funds to a Certificate of Deposit/Savings Account. The motes still exist, but they are harder to access and the artifact only works when the motes are committed (ie. when the funds are in the Savings Account). To spend motes on charms they have to be uncommitted (ie. Withdrawn).This brings up another question concerning Essence and Motes. So, the more Artifacts a character is attuned to, the less Motes they can use? Or is that Mote number just there to put a cap on how many artifacts one can be attuned to?
You'll notice I use the term committed here, it's actually used for more than just attuning an artifact. See, when you use a charm with a duration longer than Instant, those motes behave in the same way. They are set to the side in reserve and then spent when the duration ends.
Why all the complexity for charms now too? Well the designers thought it'd be a good idea to prevent a character from being able to recover motes spent on the effect of an ongoing charm/magic/artifact. So they concocted this scheme to basically reserve motes in a way to reflect that they are "in use"... At the table though, it's another layer that can slow things down and make things a bit annoying for those not fond of having to do a ton of bookkeeping. So opinions on this decision may vary.
For what it's worth, I believe Exalted Essence deleted this concept from their ruleset, so I'll let that bit of trivia speak for itself.