Why didn't Vegeta's tail grow back?

[SSJ2]

Goku's tail continually grew back even when it was cut off.

 

[GreatSaiyaman123]

Toriyama has explained tails are recessive traits, so Gohan and Vegeta’s stopped growing. Wouldn’t be surprised if Vegeta refuses to keep his tail to show he doesn’t need it, though.

 

[Captain Cadaver]

If we're to bring in DBZ Kakarot, that explains this as there being an 8% chance of a tail regrowing when cut, making it essentially a gamble if it grows back or not. It also makes it apparent that Saiyans become unlikely to have their tail grow back when their power reaches a certain threshold (ie. getting close to achieving Super Saiyan under the right conditions) which makes sense when both tails and S-Cells are genetic traits and those with a naturally greater amount of the former such as Goten and Trunks or the U6 Saiyans were born without them.