This issue tracks items remaining from adding MPK support in #7072:

• fix tests when MPK is enabled (e.g., some tests of instance limits change due to striping)
• add WebAssembly-level tests checking that MPK-protected slots cannot access OOB regions
• enable MPK in fuzz targets
• add example showing how many memories can be pool-allocated with the feature on versus off
• fix up the MPK and memory_pool documentation; e.g., remove duplication
• handle protection key changes across asynchronous block_on changes (see store.rs:1947)
• figure out a way to run with MPK enabled in CI (QEMU?)
• benchmark call performance with PKRU switch

There may be others but these are the ones I could think of that would be needed before configuring the feature on by default.