iMessage existed for maybe a decade before RCS had a widespread rollout? Yes, everyone now uses RCS, but that has only been true for the last few years. iMessa

iMessage existed for maybe a decade before RCS had a widespread rollout? Yes, everyone now uses RCS, but that has only been true for the last few years. iMessage still has some features that RCS doesn't, and Apple had a 10 year head start on integrating these features into their phones.