Why aren't the ground vehicle sets/rotations updated?

Why aren’t the ground vehicle sets updated, since vehicel brs change over time? And even if these sets are not determined by br, wouldn’t the statistics say some vehicols don’t belong where they are?
Like for example in the current the vehicles form around 9.0 to 10.3 are, then what does the HSTVL do there? It is 11.3! And why aren’t some tanks from 9.0 there, like the type 74 E, when the F is there (same br, foldered). Doesn’t a vehicle going up in br means it is preforming too good, so it should fight stronger enemies?

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