I suppose a downside (depending on your perspective) of this is that it will make people who are genetically modified in this fashion trivial to detect.
That's good if your goals are to detect genetic modification which may be considered cheating in competitive sports.
That's bad if your goals are to detect genetically modified people and discriminate against them.
I see a near future where the kind of people who loathe things like vaccines and genuinely believe that vaccines can spread illness to the non-vaccinated feel the same way about other things like genetic modification and use legal mechanisms to discriminate and persecute people who are genetically modified.
That's good if your goals are to detect genetic modification which may be considered cheating in competitive sports.
That's bad if your goals are to detect genetically modified people and discriminate against them.
I see a near future where the kind of people who loathe things like vaccines and genuinely believe that vaccines can spread illness to the non-vaccinated feel the same way about other things like genetic modification and use legal mechanisms to discriminate and persecute people who are genetically modified.