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It is very reasonable if Maguire is under tremendous pressure because he was bought at a very expensive price by Man United so the expectations are definitely high. He has passed 4 seasons but instead of making a meaningful contribution, he often made blunders that made Man United lose. If he chooses to stay at Man United, the pressure he will face will be even greater, therefore moving to West Ham is a good choice for his career.
It is clear that Manchester United's expectations are very large for Maguire, apart from being brought in at a high price, Manchester United has put their trust in him as team captain. Maguire was unable to repay the trust placed in him, he often made jokes in the Manchester United defense area when he was entrusted with playing. The pressure on Maguire was well worth the money Manchester United paid when it came to signing him, but he failed to make the cut despite being a big signing. He was one of Manchester United's failed purchases, selling him would be much better for him than continuing to survive under the management of Ten Hag who did not include his name in this season's plans.