Bionic Stock Root Access

I don't know if this is mentioned anywhere else except for one guy who mentioned it but I had the Bionic for one day before I decided to return it because I like my X. But when my Bionic was stock and I download Root Explorer from the market, it gave me full access to the root files. MT phone was not rooted but I was able to access system files and change my boot animation and delete files, etc. Ad if I was rooted. Anyone else notice or try this?

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