The issue is risk versus reward. I wouldn't risk my $6,000 investment in 2 bodies on the chance that I might save about $30 on a battery. Is some third-party company going to pay to repair your body if their battery damages it?
Please show me any post anywhere on the net that has proof of a third party battery damaging a camera.
That's like saying that if you don't put a genuine GM air filter on your engine, you risk damage.
C'mon! The risk is so low as to be non-existent.. but you go ahead and buy overpriced OEM batteries, most of which are made by the SAME companies that are selling under their own brand name for much cheaper.
I own 10 LP-E6 batteries not by Canon... as well as four Canon brands. Four of the batteries do not have the info chip, and I don't use them much anymore for that reason. My Wasabi's have been PERFECT, with no loss of power; charge evenly and quickly; and work just as well in all three of the cameras I use them in. (7D,5DII,and 5DIII)
If these batteries caused damage in high-end cameras, the news would be all over every photo forum and Photocentric web site in the world.... so where's the substantiation for your caution? You run a much higher risk of damaging your camera by dropping it, or banging it, or playing with your mirror/sensor than you do with batteries.