> iMessage works on wifi without a cell connection
How often are you in a situation where you do have WiFi but don't have a cellular connection? In my experience, the opposite is much more common--not having WiFi but having reliable cellular data.
In any case, WhatsApp, Telegram, Messenger, and open source solutions/protocols like Signal also work on WiFi without a cellular connection.
> green txts constantly break group messaging to the point where I refuse to add my friends partners who dont have iOS
Wow. I feel sorry, not for you, but for your friends who chose to be friends with someone so shallow.
> there are no abilities to admin group messaging with green txts (change the name, add/remove people, etc.)
Who cares? In more than two decades I have never once felt compelled to change the title of a group text, of all things. How often do you need to add and remove people from an existing group text anyways? Group texts, at least for me, have always been ephemeral--for example, a few messages exchanged to coordinate a date and time for dinner plans, and that's it. If I need to add someone, I'll just make a new group text or relay the information independently, it's not that hard.