There are some players that play while comentating. They don't usually talk a lot, and they are less competetive while comentating, but it's a thing. For examp

There are some players that play while comentating. They don't usually talk a lot, and they are less competetive while comentating, but it's a thing. For example in Polish sc2 scene there's Indy who usually talks while playing and is semi-proffesional (won some small tournaments but isn't considered tier 1 like Nerchio, MaNa, Elazer).