I will voice my appreciation for this thread. ARC is great, when the reset is controlled and I would love to have ARC for the 38xx series that would reset only when they fall below 10% or so. As it is today, they reset often enough that even a day of constant printing will not show accurate levels. This is dangerous, since the printer can run a cartridge dry without you knowing it. When I have my printer running all day, there is no need to take the cartridges out and shake them. Instead, I must remember to stop printing to physically look at each cartridge! Doing so increments the "removal counter" and eventually, I will have to reset it with the Service Program.
To avoid some of these issues, I removed the ink door. A cut piece of cardboard fools the door sensor, and I can now get a feel for ink levels with a flashlight. I can also refill with the printer off, so it doesn't know that I've removed a cartridge.
The annoyance could be mitigated by having fully transparent cartridges, rather than the frosted plastic today. China: You have been notified!