Apple will use it's dominant position to create lock in like how they did with iMessage instead of cooperating with other platforms on a common standard.
Oder friends and family are surprised when they want to video call over Facetime and find it hard to believe other people's phones don't have Apple apps.
The telcos specify the size limits of MMS messages. iMessage has much higher limits in most cases, so iPhone has to use reduce the quality of the pics/videos to reach the lower size limits for sending to non-iMessage recipients.
For the telcos, why would they upgrade their size limits for MMS - it's just a cost centre for them. They probably make more by selling more iPhones as well.
Android implemented RCS and Apple dragged their feet in implementing the standardised platform such that high quality messaging was seamless and agnostic between brands
The iPhone needed to reduce the quality of pics/videos to non-iMessage recipients because Apple didn't support any other form of non-iMessage messaging.
Who sets the MMS limits? the telcos - actually min(both ends), the iPhone sender's telco and the recipient's telco.
iMessage was introduced in 2011. see https://en.wikipedia.org/wiki/IMessage
Google announced RCS support for Google Messages in 2019. from https://en.wikipedia.org/wiki/Rich_Communication_Services
"In June 2019, Google announced that it would begin to deploy RCS on an opt-in basis via the Messages app, with service compliant with the Universal Profile and hosted by Google (i.e. Jibe) rather than the user's carrier, if the carrier does not provide RCS."
Yes Apple provided an improved messaging service before there was one via iMessage, however they have failed in allowing their service to integrate with the rest of the industry that is looking to support an improved open standard that would allow for a better experience between different mobile operating systems.
The original point you commented on was about Apple not integrating with other platforms.
As I said, I'm an Apple guy but Apple should've implemented RCS as soon as the telco's supported it.
My Telco, the largest national mobile carrier, still does not support RCS in 2025, which makes RCS and which mobile platform supports it and which does not a moot point for me.
Telcos do not have an incentive to upgrade the messaging infrastructure alone unless the upgrade comes as part of the core network upgrade, which is usually bound to the number increase in <whatever>G. Since the introduction of 4G, when mobile networks turned into dumb data pipes for everything, including voice, there is very little money to be made in the telco business. ISP's have suffered the same fate.