In 25bb Spin & Go spots, having a Limp/Induce range from the SB helps a lot with pot control and range protection. If you only play Raise/Fold, your strategy becomes very face-up and easy to exploit.
Limping allows you to realize equity with weaker
hands, keep dominated hands in from the BB, and induce aggressive mistakes (over-iso raises or shoves) from opponents who try to punish limps too hard. It’s especially effective against high-frequency iso or shove players.
A mixed strategy (limp, raise, limp-call, limp-raise) also keeps your strong hands protected, since you can trap with premiums while still having strong postflop playability.