Since I'm in a ranting mode -- here's a good example: you're limited to _ONE_ IO per shard in the history service: https://github.com/temporalio/temporal/blob/

Since I'm in a ranting mode -- here's a good example: you're limited to _ONE_ IO per shard in the history service: https://github.com/temporalio/temporal/blob/e22e6304b3c4a409b3f5c66ab0f3385d9e610270/service/history/shard/context_impl.go#L2105 https://github.com/temporalio/temporal/blob/e22e6304b3c4a409... https://github.com/temporalio/temporal/blob/e22e6304b3c4a409b3f5c66ab0f3385d9e610270/common/dynamicconfig/constants.go#L1802 https://github.com/temporalio/temporal/blob/e22e6304b3c4a409... Temporal does a crazy amount of database operations and all of these are behind that mutex. Oh, and you can't change the shard count on existing clusters. Great stuff.