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It comes down to two factors. Firstly, the v6 is not designed for creality machines so you are forced to use 3-d printed parts to hold it in place. This isn't an issue from a heat perspective, rather there is never going to be perfect connection with the carriage. This becomes an issue at high speeds and accelerations in the form of excess vibration at the nozzle.
Second factor is size. The v6 is significantly larger than the stock, and therefore sits much further out from the carriage. Again, at high accelerations, this imparts significantly more torque to the whole carriage.
All in all, the creality carriage has two beautiful holes for mounting a very nicely designed, compact hotend. This ensures perfect metal on metal connection and decent balance. I use the MicroSwiss clone from triangle lab.