Both as Core Developer, and as someone extending the system I would like a way to clear SPI Persistence cache for a given content version, in v2 this is done by means of cache tags so this would involve adding one for content versions.

This is useful in cases like when updating a version and then previewing it both for kernel itself, but also for integrations like in the case of legacy bridge.
There are also other cases in kernel where this can be taken advantage of to clear less cache by targeting a specific version instead of all data for the content, improving system performance a bit.