Both can be true.
Two opposing principles are at work.
"Absence makes the heart grow fonder" will over time, sadly, eventually, be overtaken by "outa sight, outa mind".
Likewise, internal carbon coating will have some dampening effect, but in extremes, where the suppressor volume eventually gets reduced below a certain level by the carbon crud, it will start to get louder. From playing with suppressor fillers and noticing the benefits or irregular surfaces inside it (even when you put a lot in) I suspect it the tipping point will be a very, very heavy amount of fouling.
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