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Account data skew refers to a situation where a single account has a disproportionately high number of related records, such as contacts or opportunities. This can create issues in how Salesforce manages record locks and concurrent access to these records.

When many users try to update or access records related to the same account simultaneously, the system may lock records to maintain data integrity. This locking mechanism can lead to performance bottlenecks and negatively impact user experience since users may encounter delays or be unable to access records altogether.

In essence, the skewed distribution of records can lead to increased contention for the same set of records, which amplifies the chances of record locking. This explains why the issue that may arise due to account data skew is primarily related to record locking, causing significant operational challenges within the Salesforce environment.

As for the other options, enhanced sharing capabilities and reduced data redundancy generally point to the positive attributes of a well-structured data model, while faster performance of queries would not typically be associated with account data skew, as skew usually leads to slower performance due to the aforementioned locking issues.