Oh Franky. You had so much time to learn about Lightning, but you obviously still have no idea how it actually works. You pretty much sound like CSW, when he explains Bitcoin.
when you look at your LN gui and when you are sending msats in onions to the leapfrog game of middlemen who need to agree.. . you are thinking that you are going to get a 1:1000 rate of sats:msats when its time to broadcast.. right?
Why are you so worried about msats? You're aware that msats are rounded down to sats when closing a channel, so you can 'lose' at most 999msats or just less than 1 satoshi?