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Properly Deburring (Reaming)
Deburring copper tubing (often called reaming) is the practice of running a blade around the inside of tubing after you cut it to remove the burr edge from the inside.
It's an important practice and should be performed whenever practical to reduce turbulence inside the lines, as burrs can cause turbulence. HOWEVER…
YOU MUST MAKE SURE THE SHAVINGS DON'T FALL INTO THE LINE
Whenever possible, point the open end down while you run the blade around the inner edge. Then, tap the line to ensure that the shavings fall out of the line rather than into it. In some situations during repairs, it may make sense to purge nitrogen out the line you are deburring, especially in repair situations, like replacing a compressor, where making the lines point downward may be impossible.
If you are given a choice where you must choose between deburring and possibly dropping shavings into the system, I would rather you didn't deburr.
In the case of making flare connections, deburring is critical. For a flared tube, it is also vital that you don't over-ream the tube and thin out the copper edge. Otherwise, it will be prone to cracking.
Deburring is important, but keeping shavings out of the system is even more important.