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Purely reactionary playstyle, second only to full baton pass as the least skillful in any gen. It doesn't help that stall v stall turns into "who has the most free time" if both players keep rocks off and play well. Also hugely matchup based, you can win or lose at preview based on how well you prepared for the six threats they happen to have.
For me, "takes so long" isn't even the biggest problem with it, it's that nothing's really happening in all that time. Chess can take hours but each player is slowly changing their position every turn, with stall you've already won or lost at matchup or within the first ~100 turns most of the time.