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Yes, RCS in Messages is Apple adding support for a cellular carrier messaging account.
  1. If the carrier doesn't have RCS enabled for iPhone, you won't get RCS.
  2. If they have features not supported in their RCS implementation, you won't have those features.
  3. If they have limited the size of shared photos and videos, they will get sent shrunk/blurry.
Google was the one pushing RCS because they sell a server for it, and they integrated phone support for it. They also happened to have failed at well over a dozen prior chat attempts, and RCS was the one which stuck for them. But it wasn't until carriers said they wanted iPhones to support RCS that it went in - often externally influenced by the government - that iPhone support got implemented and started to get rolled out.

Sounds like in Australia, the big three aren't feeling pressure for universal RCS support.
WhatsApp long solved cross platform messaging.
 
WhatsApp long solved cross platform messaging.
WhatsApp is also a commercial product with all clients and servers owned by a single company. It solves the usability problem but not the 'locked into a single vendor for critical infrastructure who determines what is appropriate compensation for access at any given moment' problem.
 
WhatsApp is also a commercial product with all clients and servers owned by a single company. It solves the usability problem but not the 'locked into a single vendor for critical infrastructure who determines what is appropriate compensation for access at any given moment' problem.
That’s not a concern. WhatsApp is free.
 
Yes, RCS in Messages is Apple adding support for a cellular carrier messaging account.
  1. If the carrier doesn't have RCS enabled for iPhone, you won't get RCS.
  2. If they have features not supported in their RCS implementation, you won't have those features.
  3. If they have limited the size of shared photos and videos, they will get sent shrunk/blurry.
Google was the one pushing RCS because they sell a server for it, and they integrated phone support for it. They also happened to have failed at well over a dozen prior chat attempts, and RCS was the one which stuck for them. But it wasn't until carriers said they wanted iPhones to support RCS that it went in - often externally influenced by the government - that iPhone support got implemented and started to get rolled out.

Sounds like in Australia, the big three aren't feeling pressure for universal RCS support.
Probably as a lot of consumers don't understand that the restriction isn't Android or iOS but have long had to live with the restrictions/differences being driven by Android vs. iOS so live the fact that the Telcos are screwing them over.
 
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