Why did the Rightly Guided Caliphs switch from tamattu ‘ to ifraad (in Hajj)?

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Check below answers in case you are looking for other related questions:
What is meant by ‘umrah in Ramadaan being equivalent to Hajj
Is it permissible for him to go for ‘umrah when there is an unsettled dispute between him and his friend?

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‘Umrah on the part of a child who has not reached the age of discernment
Will the one who does Hajj or ‘Umrah on behalf of another person have the same reward?
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What is meant by ‘umrah in Ramadaan being equivalent to Hajj
Is it permissible for him to go for ‘umrah when there is an unsettled dispute between him and his friend?

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