The Google Messages app is very much like Apple’s Messages app, When an Android user sends messages to another Android user employing the Google Messages app, the messages enjoy end-to-end encryption, no limit on character capacity, higher-quality image sharing, read receipts, message indicators, and more. And guess what happens when an iOS user joins the group; all of these lovely features are disabled.
At left, both sides are using RCS on Android. On right, one party is using an iPhone

At left, before the rebranding. In the middle and right, note the use of RCS chats. Image credit 9to5Google