Just my 5c as a long time musician.
Whilst songs like I wanna hold your hand are not musically complex, huge pop hits are not easy to write. Great simple hook songs are in fact harder to write, If they were easy, everybody would be doing it.
To get the top 5 hit singles in a US national phisical singles chart has never been done by anyone else since.
with “Can’t Buy Me Love“ at No. 1, “Twist and Shout” at No. 2, “She Loves You” at No. 3, “I Want to Hold Your Hand” at No. 4, and “Please Please Me” at No. 5 (“I Want to Hold Your Hand” and “She Loves You” had already hit No. 1 in earlier weeks).
For me, Please Please Me is 2:27 example of the perfect pop rock single.
People underestimate the difficulty of keeping it simple. ACDC follow a very simple formula too, and again are masters of doing it. Whilst Angus is the flashy star, the core drive and soul was Malcolms incredibly restrained powerful rhythm playing, along with the awesome Phil Rudds meat and potato rock solid tempo drum beats, a symphony of just Kick, Snare and Hats and the odd cymbal smash.