Some people do just talk as if a higher SR just makes a batsman better, though
@Blenkinsop has made a better point, though, The ability to shift gears is the important thing, and career SR doesn't really convey that a lot of the time. And sort-of related, there are times where the SR of an innings just doesn't really matter. Warner, for example, presumably has a fair number of innings where he's scored quickly from the start, got out for a low to middling (or even decent) score, so the quick scoring hasn't really mattered (unless you want to argue that quick scoring always means more runs overall because of pressure on the opposition) and across a career, a having a number of these innings will push your career SR up a bit compared to someone like Cook, who may have made a similar number of somewhat inconsequential scores, but at a much slower pace.
If I remember to, I will try to articulate my argument better in the morning