The discipline of a three minute song
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Writing within a genuinely short runtime forces real discipline on any songwriter, since every section, the verse, the chorus and the bridge alike, has to properly justify its own place within the arrangement, given that there is comparatively little room left over for ideas that do not directly serve the song itself.
This particular constraint often improves overall craft rather than simply limiting it, and knowing that time is genuinely short tends to encourage writers to reach their hook noticeably earlier, trimming away anything that might otherwise delay a listener's connection to the song's central, most important idea from the very start.
A tightly written song also rewards repeated listening in a way looser songs often do not, and because nothing within it overstays its welcome, a well edited three minute track can be replayed again immediately without ever feeling repetitive, which is part of why the format has remained so durable.