Offal is right. IMO, large X-height fonts are only suitable in situations where you need to use extremely small text and then only with reasonably large leading, relative to the point size. When the larger leading ("line spacing" in newspeak) is used, the whitespace between lines of body copy remains reasonable and readability is maintained. There may be some actual improvement resulting from the relatively smaller ascenders and descenders and the reduction of visual conflicts between descenders on one line and ascenders on the line below.
For some comic relief, track down a copy of Fredrik Brown's short story ETAOIN SHRDLU, though some basic knowledge of the use of Linotype machines and terms is helpful.
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