This verse is so well-known and so much loved because it has a simple wording but it has a deep meaning. It speaks to everyone, regardless of background, making it relatable and accessible. God's love is unconditional and He really loves the whole world. He didn't allow many to perish, so this is not inconsistent with His love for the world. God offered salvation to everyone, He invites everyone to believe in Him. It is our choice to believe in Him and to accept His gift of eternal life. Other people chose their own path that leads them away from Him.