OK, I'll jump in here. I usually trim off borders; my choice. But some decks are simply ridiculous. For instance, the Russian Tarot of St. Petersburg (US Games). It has a quarter inch gold border. OK, I can deal with that. I can cut it off if I want. But the actual images are oval & there is scrollwork around that oval image that bleeds to the actual gold border; the corners actually have 3.5" borders of that filigree scrollwork!! & you need a microscope or a loupe to see the image. THAT is overkill & I can NOT see any tarot reader liking it. What a waste of paper & ink.
Russian Tarot of St. Petersburg
ETA: The actual oval images are 2" x 3". Come on. You could fit that on a business card.
I have never trimmed a deck--mostly out of fear, but am considering having a friend trim my Druid Craft. She has done her own and tells me it made a huge difference. The deck is one I love, but the cards are so HUGE for my small hands, I really do not use it as much as I should. It has two borders to it, so I could start with just having her trim the white border off and see how that works.
With some decks, the borders are ridiculous (such as the Druid Craft). Some others are not so bad and do not bother me, such as the Robin Wood. I have one deck that is borderless, "Fairy Tale Tarot" by Lisa Hunt, that do not have a border, and it really adds to the deck, though it does (thankfully) list the cards name at the bottom. I don't read much with this deck though, tbh, though I do love to look at it at times.
So, it really depends on the deck itself, I think. Some need the border--but a small one is really all, I think. Some I like the title of the card at the bottom too--even though I tend to read more intuitively then 'by the book'. And some really do not need a border what so ever. So, it may be difficult to say before the initial printing (at least for me) which deck I feel needs a border.
the Gilded Tarot is another deck with a border, but I feel it enhances the deck. It is also one of my fave decks. Same with Ghosts & Spirits--however, it may be one that is enhanced w/o a border. The border on that deck doesn't really bother me though.