"1. They don't seem to care about actively improving their gameplay"
When it comes to improving gameplay via ACT, I simply do not care. I am on PS4, but nothing would change if I had access anyway. This does not mean that I do not care about my gameplay and improving it, and to think that is the case with myself and other like-minded players would be objectively false. Optimizing rotations, your UI, learning the mechanics of a fight, finding ideal positioning for your current job in that particular fight, recovering from mishaps; how well you do all of that can be confirmed via ACT, sure. At the same time though, if you are doing all those things well in any given fight, you don't even need to. There are more tools to improve other than ACT, and ultimately what I care about are clears. I couldn't care less if they come a little slower.

"2. They don't seem to want to play the marketboard"
The market board is not for everyone. You can spend all your time logged in managing your wares, and the moment you decide to do a roulette or craft some more stuff, the 1-gil undercutter makes the sale *whomp whomp*. This complaint is odd, as there are no shortages of MB sharks, and the 'lil guppies they consume by the mouthful. Some even consider the market board the game's true PvP.

"3. They are more interested in doing outdated content than current seasonal content"
You basically described me with the outdated content, but this is how I would describe anyone who does activities outside of raiding. If you're not raiding, then you're not doing current content. For me, I am always looking for the next grind, and I go into whatever content is required to accomplish that.