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Given that smach is released into Indigo, that's a good sign that it's still maintained.

There are a few open issues, but nothing major. I suspect you could get the maintainer's attention and get a bug fix accepted and released if you found a major bug. That said, smach has been around for many years, and I suspect most of the bugs have been worked out by now; don't confuse a lack of changes for lack of maintenance.