Those seem like very reasonable points. Are you confused by the terminology? If so: - "x" height refers to the height of the mean line of lowercase letters, e.

Those seem like very reasonable points. Are you confused by the terminology? If so: - "x" height refers to the height of the mean line of lowercase letters, e.g. the lowercase letter "x". Ascenders (on letters like l, t, k) will exceed this height. - height-to-width: seems straightforward: wider fonts may often look more modern (see e.g. the Eurostile vs. Frutiger comparison in the article), but are harder to read. - spacing: allow for enough whitespace vertically and horizontally. This, again, improves legibility compared to condensed fonts.