Maybe we're having different things, but the vegan mayo brands I've had taste exactly like what I remember animal-based mayo tasting like and my friends and family (who aren't vegan) say it's indistinguishable for them too

Really depends on the prodct I'd say.

The egg in mayo plays a very specific role (emulsifier basically) that has very little to do with taste; I can imagine adequate vegan alternatives exist. Do you know more about this?