Once upon a time there was a valid technical reason for squishes, you saw it in fight design during SoO where bosses had to have heals put on them because otherwise their health would be too large and you’d begin to hit data integer limits of 32 bit computing (2,147,483,647).
Nowadays I’m not sure wow even exists anymore on 32 bit operating systems so we should have an integer limit of 18,446,744,073,709,551,615. Personally I believe it is time to undo the squishes.