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This makes me feel that i.e. looking for bone marrow donors may become obsolete in some cases, if we know the gene sequence responsible for the disease. Instead of looking for donors, it may actually be possible to repair bone marrow cells and inject them back, fixing the problem. Am I missing something here?

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Nope, not missing anything. It should also be possible to use it it to reprogram mature cells (such as skin cells) into homeopoetic stem cells in-mass, and simply introduce them into the appropriate site (eg bone marrow, for your example)

Wait, I thought that CRISPR was a matter of gene editing but that stem versus other types of cells was a matter of gene activation? Wouldn't that require different techniques?

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