My cat is 7 months old and is a strictly a indoor cat. My windows have a gate and she's up to date with shots. The only thing i'm holding off on is getting her spayed. It seems so unnecessary. why does everyone insist on getting her spayed or else i'm a bad pet owner? I've seen her go in heat and doesn't bother me.

Do any other cat owners that don't plan to breed their cat ever choose not to spay or neuter their cat?
Thanks for pointing out the concern for cancer and infections.