You will only cover the stuck 0/1 of all pins of the memories, not so much, that are normally covered by the RAMs bist.
One issue, if you have a hardware bist, perhap, the path to stimulate the RAMs it is not the same as the functional paths, and we could not "garantee" the coverage.
To garantee the memories pins and path are correctly tested for the functional mode, you need to executed some read/write or run a software bist, but do not forget if one instance could be accessed by different path, to check all of them.