Apple say no.[1]
[1] https://medium.com/@krvoller/how-iphone-violates-apples-acce...
2) The author believes Android users’ messages show up green, so I wonder if they’ve ever even used an iPhone.
3) The messages are in fact not hard to read and you can crank up contrast system-wide if that or anything else gives trouble (and if these do, you’ll need improved contrast to browse the web, anyway).
The author identified correctly the message colors. "When you send a text to someone, your message floats to the conversation area in a blue or electric green message bubble (depending on whether you’re texting with another iPhone/iPad/Mac user or some other device)."
Many iPhone users make the error you believed the author made. And the criticism would be valid if they never used an iPhone. Please do not use logical fallacies.
Calling the green bubbles not hard to read is your opinion. Opposed by other opinions and Apple's guidelines. Not fact.
The system high contrast mode makes some other apps less accessible. It makes weather icons all white for example.
Your claim about web browsing was false.