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I think the moral of the story is simplex repeaters are, with the exception of some testing, and niche applications, very tedious and awkward to use practically. If someone is looking for a reason not to invest in a regular repeater, a simplex repeater isn't it. From experience. I built an interface and used echo station to try one out some years ago.

Reason, the law, the applied law and the FCC may or may not coincide. All I am saying is that, unlike regular repeaters, there is no basis in the regulations to state that simplex “repeaters” are explicitly allowed. Further, in point of fact, they are really not repeaters at all. They rebroadcast via store and forward technology. In addition, as far as I can tell, Argent Data Systems, the manufacturer of the "repeater" noted by @Guest_Mark Lewis_* has not certified the ADS-SR1 for GMRS, or any other service. In fact, they do not appear to even have an FCC Grantee Code. On top of that, the manual for the ADS-SR1 states:

thanks for all the info. the group i joined had to issue another radio id for him to use. just wanted to be on the safe side when using radios for communications. everything is done different on gmrs than public safety which is what im more used to using