Tokio mutexes are only useful if a lock needs to be held across suspension points. Since futures can migrate threads between suspension points and most regular mutexes on most platforms do not support being unlocked from a different thread, tokio’s mutex has a very narrow but a well defined use case.
Another use for tokio's mutexes is that they won't block a thread while waiting to acquire the lock (as awaiting a tokio mutex is itself a suspension point). For some use-cases this might not matter, though.
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Tokio mutexes are only useful if a lock needs to be held across suspension points. Since futures can migrate threads between suspension points and most regular mutexes on most platforms do not support being unlocked from a different thread, tokio’s mutex has a very narrow but a well defined use case.
Another use for tokio's mutexes is that they won't block a thread while waiting to acquire the lock (as awaiting a tokio mutex is itself a suspension point). For some use-cases this might not matter, though.