Why wouldn't they just match the Japanese silver border?
It doesn't match the color of the 'template' of the rest of the card. i.e. the card art border is silver, the stage indicator is silver, the weakness/resistance and retreat bars are silver. There are absolutely times the yellow border goes from mild annoyance to outright nuisance, such as on the Amazing Rares, and Radiant cards. You can't really tell me that there is nothing wrong with the yellow border on this card.
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Yeah, why they insist on not making it silver like the japanese ones is beyond me. It is, for all the reasons you already explained and then some, such an obviously worse choice, that they should've gotten past it a long time ago.