Everyone has their own estimation of who is collecting Luxor or who has the most victory points. The perfect counters do it better than others, but most players can learn to do it if they feel the need. In most games with hidden, trackable information, the better you track, the better you will do. In a game of Acquire with closed holdings, the most accurate tracker is likely to win because the others will waste more time and money buying stock that can't help them. In many of these games, if you don't have a good sense of who has what, you might as well be playing randomly.
Every game presents challenges.
In a game with hidden, trackable information, one of them is the tracking itself. In many such games, the memory element is completely unconnected to the other portions of game play, and many players would just as soon do without them. A bigger reason seems to be simply habit. For someone who has always played Acquire with closed holdings, that's just the way the game is played. Anyone who suggests playing it differently is well, just not playing it right.