Fair enough, but I think we are talking about different things here: distilling vs changing.
To me, "minimalism" involves taking something established and reducing it to its elements — NOT CHANGING IT INTO SOMETHING ELSE ENTIRELY; that is something else. Minimalism is not just slapping one simple thing in an image — especially something that narrows or changes the possibilities. Minimalism is reducing a concept to its essence and communicating it in as simple and sophisticated a way as possible. Sometimes a single line can do that, or a circle placed in a certain way, other times it requires more. This is the challenge that the minimalist artist faces.
I agree that certain artistic representations of cards may limit the reader, especially when that image changes at least the surface meaning of the card, which is EXACTLY why I chose to NOT use representational art, but rather minimal, abstract, and symbolic art for my particular "minimal" deck.
Again, I can't speak to all minimalist decks, and in my research before, during, and after creating the Orbifold, I have come across minimalist decks that I am really not fond of, that I don't "get" for whatever reasons, or that I don't feel represent the tarot's system well, or as well as they could. However, that doesn't necessarily make them no longer tarot.
To use your analogy, it's more like playing tennis against one opponent who likes to volley a lot, to play the court and explore the nuance of every hit, every shot, every bounce -or- playing against a player who is much more efficient in their strokes, going for points with minimal effort, minimal play. BOTH are still tennis, it's just that the style of play is very different. Now, if one person is playing squash, and the other tennis, THAT is more like comparing playing cards to tarot (which are still both very similar, since playing cards are essentially tarot without trumps). But then of course, if you go from racquet sports to, say, baseball, OK now you're talking entirely different systems — runes compared to cartomancy or something of the like.
This idea that tarot's meanings are fixed is extremely limiting (and rather modern), and if you talk to certain people who read Marseilles, the downfall of modern tarot (I don't necessarily agree, I like my illustrative decks that resemble to greater or lesser degrees the WST), but they are incredibly restrictive.
Take 3S for example: the tired old pierced heart is only ONE of many possible meanings that the "three" and "swords" can mean. Of course, that image is rich with many meanings that extend well beyond simply "sorrow" or "heartbreak" so even the limited image is still quite extensive in its possibility — and could be one reason why it has endured since Pamela drew it 100 years ago. HOWEVER, if you go back to pip decks, the possibilities for meanings are much wider, and depend on context. That doesn't mean that the card no longer means ANYTHING because it suddenly means EVERYTHING, no, it still has parameters — "three-ness" and "sword-ness". This is incredibly liberating.
My analogy with at least my deck and similar ones is that the deck does not impose its meanings on you. Instead, they draw meanings out of you. But this is a scary proposition, as so many of us approach the tarot expecting it to tell us what to do, rather than having it reflect back what is within us, revealing what we already know, but just can't see. Reading in this way requires stepping out of the box rather than fitting into it — of using the system as a tool for liberation.
One of the reasons I even designed a "minimal" deck to begin with was because I found when I was reading, I was constantly REDUCING the cards to their essence: their numbers and their elements. Even one of my favorite exercises for learning a new deck is to lay out each suit in its entirety to get a feel for that artist's view of the suit and element, then lay out all the ranks (all 3's or all 8's) to see how 3-ness or 8-ness is expressed.
A WELL DESIGNED TAROT, in my opinion, IS CONSISTENT IN THIS STRUCTURE from suit to suit and number to number. ALL 5's should have something in common that expresses "5-ness" and if you look at Thoth, WST, and the other more enduring decks, this is the case.
At any rate, no matter which deck I was using, I found that my reading method involved this reduction of cards to suit/element + number, and then layering the imagery on top of that. Fine enough, but man, it was a lot of work! So the Orbifold was initially for me to not have to do all that pre-work and start off the bat with those essences of the tarot structure. From there, ANY meaning of, say "3-ness" and "air/swords-ness" is available and untainted by the limitation of "sorrow" or "heartbreak" (yet could certainly still include those associations, depending on the context).
This is absolutely still tarot. It's nothing new, it's nothing groundbreaking, it's rather the foundation on which all of what we've come to know about tarot is built.
Structure, scaffolding, 78 cards, context, tarot.