I understand why Goku's Tail never grew back, Kami said it would hurt when he cutted it, so he probably tore the thing right out of it's socket. But Vegeta's tail was just cut off enought for Vegeta to lose his transformation, with the surface left intact. If Goku and Gohan's tail always grew back, why not Vegeta's?
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Only children grow their tails back......Adult sayians dont have the ability to grow the tail back. I dont think trunks or Goten ever had a tail which is a little weird unless kami removed theirs too although I don't think Vegeta would have allowed that.
somewhere goku said something about how they thought the tail would prevent them from going ss that it redirected the enegry or something like that. As for trunks and goten kami was merged at the time i think bulma and chi chi had them remove it. Its like gokus the tail was cut off to far in to grow back to normal. Thats why they had to use the tweezer in gt to get gokus tail out
Kain:History is irredeemable. Drop a stone into a rushing river the current simple courses around it and flows on as if the obstruction were never there.
Goku's was removed by Kami during is 3 year training prior to the 23rd tournament for safety reasons. Bulma and Chi-chi had Trunks and Goten's tails removed for the same reason. Gohan and Vegeta's tails just up and disappear. Vegeta even states to the doctor after healing from his battle on Earth that it would grow back. It just didn't.
So again, the answer to your question is: Who knows.