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A superblock is a block that's larger than a normal block, generally due to the city abandoning streets to a developer. But a "porous" street network is paramount for walkability -- and superblocks clog up that porosity. These large blocks of land/buildings reduce the accessibility and explorability of an area by foot.

So preserve the streets that we currently have by not abandoning them to future development -- the first of which comes to mind is the portion of Pierce St that the Phoenix Biomedical Campus is interested in removing.

And also, when/if redevelopment of current superblocks happens, regain the streets that have foolishly been abandoned to them. An example would be at The Met apartments which superblocked over Pierce St: a development that has potential for redevelopment in a few decades when the rest of downtown builds up because the 20/acre density of that complex will be ripe for an upgrade.