In fairness, Gallup also doesn’t list the makeup of the Supreme Court, “draining the swamp,” the deep state, or a bunch of other issues. They asked about 16 issues. I’d imagine if they tried to cram in many more, people would stop responding entirely.
I clicked the link. One tidbit I noticed is that Ds on average find 5.1 of the issues to be “extremely important” while R’s find only 3.2 extremely important. (This renders one of their tables somewhat silly.) According to Gallup, whichever Party is NOT in power tends to find more issues to be extremely important.