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I had the same revelation in 2019 when I started my first LN node.
I was playing around, learning and one day when my shitiest channel was empty I made a swap-in from onchain and repeat the process over and over.
I realized how many sats I pass through that damn channel when I close it and saw that the only information remained was just a tiny amount from the channel reserve (I close it when it was empty). On the block explorer was just appearing as a regular tx showing that I "sent" to last destination address X amount of sats (the size of the channel) but not all the swap-ins, that were multiple times more than initial opening.
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This was an important revelation for me. I remember seeing you write about it and I had a channel some time ago which I used in this manner. It was pretty awesome to think that my small little channel could move many times it's size in sats.