except for the bit where it bends under its own weight
absolutely agree, regular cleaning is the best value for money "upgrade" you can do to any airsoft gun.
i do agree with you on the higher maintenance of the tighter bores, i do run 6.01's even at 450mm. even with religious pre-game cleaning a heavy enough round count can mean it needs another swab mid-day
of course there are a multitude of factors that feed into accuracy, a beautifully polished perfectly cleaned top-tier quality barrel is gonna be absolutely useless if you're trying to yeet .2g bulldogs out of a gun with terrible airseal.