The assert helpers in https://github.com/mongodb/mongo/blob/master/jstests/concurrency/fsm_libs/assert.js don't really do anything different than assert. We tried to use them originally when we introduced the concurrency testing infrastructure but we never ended up fully implementing it and making it work.

As of today, we are still adding more and more instances of these asserts and engineers don't really understand what exactly they are doing. We should just remove them.