True, but even 4 inches is already a perfectly acceptable display size (and you can push at least to 4.5-4.7 without compromising ergonomics; see the Sony XZ2 c

True, but even 4 inches is already a perfectly acceptable display size (and you can push at least to 4.5-4.7 without compromising ergonomics; see the Sony XZ2 compact, the single compact phone in existence in the last 2 years).