Final answer:
The default location for Hive metastore storage is considered suboptimal due to performance issues related to scaling and concurrent workloads, leading to slow metadata operations and a lack of advanced features needed for large-scale data warehousing.
Step-by-step explanation:
The default location for Hive metastore storage is often considered not ideal primarily because of performance issues. The default configuration generally uses an embedded Derby database that is fine for lightweight workloads and small numbers of users but can become a bottleneck when scaling up for larger, more concurrent workloads. Such setups can lead to slow metadata retrieval and updates, which can severely hinder performance. Moreover, the default location typically lacks the robust features required for handling large-scale enterprise data warehousing operations, missing out on optimization, high availability, and failover capabilities found in more advanced metastore setups like those using MySQL or PostgreSQL.