Was Magnus Carlsen Wrong About Chess Fortresses?

After the fourth game of his 2016 world championship match versus GM Sergey Karjakin, GM Magnus Carlsen famously said, "I don't believe in fortresses!" What he probably meant is that even though fortresses do exist in chess, the majority of the positions that look like a fortress can be penetrated. Unfortunately

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Can somebody explain me the general concept why long castles is bad and king castles is better in this position? If it matters, i'm 1500/1550 : r/ chess

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