Depends on what do you mean by “taste like olives”.

For example, someone saying pizzas all taste like pizzas could be right if they mean that they all have the base taste of the dough. But then the overall taste is very different based on the toppings.

Taggiasche olives have a much stronger taste, something that’s usually made with Green ones would probably suck made with them and vice versa, that’s what I mean.

First of all the black and greens have quite different taste. The taggiasche have a totally different flavour. Like there's people not liking black olives but are in love with taggiasche.