What do you know, and when did you know it?
Sometimes, as an experienced table tennis player and coach, I watch newer, younger players as they move up the rankings, and think, "If only they knew what I know." So much of table tennis is "getting it," i.e. knowing how to win - and there are all sorts of ways to doing this. But they all come from learning the frame of mind that allows you to pick through the fog of war (I mean match play) and find a way to win, both in developing your game (strategic development) and tactically (tactical development). This is probably true of most experienced players, at least those who have also gotten through the "learn how to win" barrier.
How do you learn how to win? Some do it by consciously being aware of what wins and what doesn't, and working toward maximizing the type of play that wins, both in strategic development by practicing those techniques that win when developing their game, and tactical development as they learn to use these winning techniques. Others do this instinctively - especially the tactical part - never really "knowing" what they are doing, and yet seemingly able to feel their way through matches with smart tactics. However, I don't think you can really develop your game to its full potential by feel - you should spend time thinking and analyzing.
I've never bought into the "thinking too much" myth - you can never think too much, you can only think at the wrong times and about the wrong things, and of course you can think poorly - but you also have to learn to play by feel so you can take advantage of instincts developed from years of playing. Most go the other way and don't think enough - and not enough thinking makes you just another dumb player at the mercy of a thinking opponent, both strategically and tactically. And that's exactly where far too many players are at - they don't yet "get it" in terms of learning how to win.