No, but it may not sharpen your skills as much as playing a human. Some ppl (like myself) can't take a computer game as seriously as an OTB game against a human. But computer play is fine for some forms of training & if you lack human opponents
Does playing computers weaken your chess?
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In my opinion, I don't think so. A 1350 rating is an average. Sometimes, that player plays like he's 1500. you can't be that cut and dry with ratings.
Indeed. No, playing an computer (at whatever level) doesn't weaken your game. Beating such an program builds confidence. Although, common sense says, if you play it an million times with the same variation, you're just out to pump your rating or you're just taking it for granted that you'll always win and not challenging yourself enough with such an resource.
I have been playing the medium and hard computer (chess.com) and notice that the machine is easier to beat than a human at the same rating level. In my opinion, a 1350 human is harder to beat than the 1500 hard-computer. So, does playing the machine weaken chess skills?