My fitment and specific measurements have evolved over time, but I have set numbers now for saddle height, saddle setback, and saddle-to-brake-hood-"notch" reach. This tends to keep me in the 63cm-65cm range primarily and that's good for a lot of reasons. If something cool is too small, well, it's too small and I wish it well and move on.
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Top tube is but one measurement for reach from the saddle. Top tube, stem, bar reach, and brake hood "reach" (to the "notch" or kick up point) all add up. Many here and everywhere don't even talk about or take into consideration a bar's reach, and that can vary quite a lot!