Now there’s a thing – my Align make unit came with a limit switch block on a flying lead. The two micros switches connect to relay coils in the unit electronics, each stopping only the appropriate rotation so that the opposite direction still works. It looks like the Chinese item in the link dispenses with this, presumably including the relays.
I must say that I would find that very inconvenient. I use the feature all the time to allow doing something else during long cuts. I do make it a rule to be within immediate emergency stop distance.
The “rubber” (nylon) reduction gear has a conical mount, presumably intended to work as a slipping clutch. As delivered, the spring was far too strong to provide any useful protection, but I found a suitable lighter spring which seems about right.