No one can memorize all the positions that can occur on the chess board. If it were that simple every engine would play perfect chess. Just imagine when engines like alpha zero and leela haven't solved chess after playing millions of games than how naive is your assumption that chess is all about memorization.
Yes they can, but only a handful. That's why there are so few GMs in the world. Only a handful or however many actually have an eidetic memory.
You are either trolling or you have no idea about the number of positions that can occur on the chess board.
Go sit down and play some 10-year old GM, and then you tell me that kid doesn't have every single move counter move memorized in his head when he wipes the floor with you.
So you are a low intellectual troll.
OP, you should probably avoid going into law or medicine.
he should probably just avoid gettibg out of bed in the morning altogether.
Awwwww....did I upset your delicate chess sensibilities?