I thought that was covered by me saying "the DM could ask you to please stop trying to break his game (or force the issue)", but yes, this is definitely one way to put a stop to nonsense!
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Sorry for my long winded post everyone, just some of the comments triggered some old PTSD (the kind of thing that spawned my custom title, in fact) about "such and such edition was busted because you could make X build", completely missing the point of theoretical optimization.
I wasn't trying to say that 13 attacks per round required any wacky builds or optimization to achieve, just griping about the way some people react to the extreme edges (let alone the theoretical ones) of a system.
Exploring the limits of a system is important, letting you find out about potential issues you might have down the road way in advance, rather than the time I was playing at a table where the DM ruled that you could make iterative attacks with your off hand in a 2e game, so I proceeded to cast Haste on the two-weapon Fighter and give him 8 attacks per round (at level, it was theoretically possible to get up to 12 in this way at sufficient level), and suddenly, that house rule was quickly overturned, lol!