The point here is that for this type of combo, we would need to worry about some details, like getting the three colors of Narsets identity, allowing her to jump in, keeping her on the table, or even ensuring that extra turns would come on her triggers, so that we don't waste a combat
They're attractive cards to be sure, but when the other options for Secret Rares are Rainbow Rare Pokmon or Shiny Pokmon featured on Gold Cards such as the Frosmoth and Galarian Perrserker in this set, I find it understandable why some find these Gold Trainers underwhelming
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Their iridescence is really great to look at (granted, for early EX, like @wisewailmer said, they really have to be pretty much mint to look really good)