Players get more exposure to the ball, leading to improved dribbling, passing, shooting, and first-touch control in a pressured, realistic setting

The smaller space forces quicker decisions and better tactical understanding, improving players' spatial awareness and their ability to make complex decisions under pressure. 

Players experience quicker transitions between defense and attack, and more 1v1 duels, contributing to a well-rounded development of game intelligence.

Most importantly, it offers increased fun and engagement:

The faster, more dynamic nature of small-sided games is more engaging and fun, especially for young players, fostering a greater love for the sport.