I think the response is because I asked if you wanted a dac/amp or just an amp and you replied an amp, so
@Ninja_Theory was responding in the context of that
As I said, I think both are useful, and measurements can be used to verify/quantify what someone is hearing etc. Zeos says something is overly bright and response graph shows it is bright - bingo it is bright. Zeos says it is bright and response graph says it is neutral... well, now you have someone's subjective opinion vs an objective (if done properly) measurement. It might be that Zeos is sensitive to bright headphones, or prefers a warmer sound, or whatever. Flip side, as you said, the graph can't tell you what you are meant to hear.
For an amp though measurements can be very useful because one can measure things like voltage spikes etc. Max power output (vs claimed specs). Or if you want a purely neutral amp, either to match your neutral headphones or on the flip side because you don't want it to either compete with the headphones color or over-ehance the headphones color then measurements are better than someone's opinion that it sounds neutral. Likewise it can tell you if bass rolls off too early, etc.
My point is, I guess, if you find a reviewer whose tastes and preferences align perfectly with yours then 100%, but to me it is useful, if only as a comparison to the reviewer's opinion.