Players often start out their careers by playing really sharp openings but switch to more solid lines over time. There are good reasons for this, not least of which is the improved positional understanding borne of experience. Once that’s in place the need for memory diminishes.
A lot of players give the sharp Gruenfeld Defence (1.d4 Nf6 2.c4 g6 3.Nc3 d5) up, almost certainly because of the level of maintenance required. And I noticed the other day that Lubomir Ftacnik seems to be among them, turning to the ultra solid Queen’s Gambit Declined.
This is actually a very good choice as understanding is far more important than a knowledge of variations. And in the following game he comprehensively outplays Gennady Timocenko.