This feels a bit like asking MS Teams to play nice with Google Meet, or demanding that Apple’s office suite (Pages, Numbers, etc.) deliver the exact same product when files are saved in an OpenOffice format. This doesn’t seem to be an issue with any other products…
Apple have designed their product to work well with their devices. The Messages app still functions with non-Apple devices. SMS messages can be sent and received to anyone. The fact that pictures and whatever come through like crap is more an issue with the SMS platform than it is with Apple’s app.
Ultimately, Google dislikes the fact that there is a “green bubble” stigma (for lack of a better word) on Apple devices that encourages those who care about such things to prefer Apple devices. Because Google doesn’t have their own widely used iMessage equivalent, they can’t turn around and make messages outside their platform appear as red bubbles or something, so they are attacking from this angle instead.