That's a strawman argument if you're really intending to abuse an illogical fallacy to refute an argument that I've never made. Unlike the example you presented, there's actually factors such as statements within the Databook as well as logical deduction that suggests that Mei's jutsu can be expanded. Unlike Mei, there's every reason to presume that Kisame displayed his largest scale techniques, especially GSB and Waterdome when the user receives little to no benefit towards condensing his own jutsu.
Now, I'm not going to claim that the lava encompasses the same scope as her Suiton, but what she canonically displayed is heavily implied to be specious through the Databook Entry and the idea behind Dodoi, an inferior Ninjutsu user,
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. Logical deduction instantly tells us that Mei can emit Yoton on a much larger scope while there's also established boundaries for the technique because there's no possible way that a KKG can somehow reach the "level" of a Suiton due to the fact that singular elements are significantly easier to manipulate than compounds.