I am sure that this will be the case amongst many readers. So what determines which reading gets the correct outcome and which doesn't? Who/what decides? And, how can we not then say, that Tarot is simply just chance?
In general (because we are not allowed to discuss this particular forum), when you have groups of people meeting to learn anything, including tarot, whether that is on an online forum, or in meetup groups, or what-have-you, there is a risk for negative
group thinking. That is to say, it is /good/ to have commonly shared meanings to learn and understand something like tarot cards
to a point. When that point is reached or exceeded in some situation, the group format no longer fits because a more individualized or personal learning experience is required, which I believe is the case for "popular readings" such as predicting a presidential election. For example, if the majority of a group does not believe that tarot can make predictions, then an individual within that group who believes tarot can make predictions is the one that suffers the consequences of group thinking, if they do not break away from that group belief and go their own way with their learning. It's a Hierophant-situation of teaching and learning in groups; a card that often gets the blame for sameness. However, the Hierophant is a 5, so the ultimate Hierophant will support the common, while having built-in customization options for the individual(s) that need to go different directions from that base of knowledge.
You gave an example of the 6 of Wands and the 10 of Swords -- cards that commonly show a winner (6) and a loser (10). I have interpreted those cards in so many different ways (as well as the other 76), that those keywords or common associations do not hold too much of a notion in my mind anymore. I still understand those basic, common meanings but they hardly show themselves to me these days. Currently, the 6 of Wands has had to do with "making the decision that puts your best foot forward" for me, while currently, the 10 of Swords has had to do with wanting "something deeper" in one's life. Not very "common" to what a learning group would say about those cards, right? Accurate meanings, for me, however.
Making accurate predictions with tarot is not chance; there is someone behind them that knew how to learn and applied their learned tarot skills to make an "educated" guess (from the support of the common experience as well as the personal).
There are a lot of deterrents to someone learning tarot within a group:
-Someone may simply not like you and decide not to listen to anything you have to say.
-Someone may decide that what you have to say doesn't fit the group mentality and decides not to give you credit where it's due.
-Someone may not like /how/ you say what you have to say and decide that what you're saying doesn't have merit because of that.
-Someone may not be ready to hear what truth you have to say and so they deny or disagree.
-Someone may not understand your level of learning, and they won't until they go through it themselves, if they do that is, and they won't if the group does not support that individualized learning... like an active researcher reporting findings back to the group.
-Sometimes, you are simply wrong, and it's hard to tell with all the previous standing in the way, but also why a personal and individualized connection to learning the tarot is important, because if all else fails, you have YOU and your best judgment.
There are a lot of benefits to learning something in a group as well, but what you are going to learn in a group is going to cater to the more "basic" or "obvious" -- you can only go as fast as the slowest horse, so to speak, unless you take those risks and break away from group-think.
In all my time, tarot has never failed to cater to my level of understanding. I've had to make mistakes and wrong predictions in order to learn something new, and I will likely continue to do so as long as I am learning tarot. I tend not to learn while I'm 'working' (getting paid) with tarot, but when I am utilizing tarot for learning purposes, it is so very exciting to discover a new meaning in a card -- like an archeologist finding something "lost". I love it!