Cross-platform messaging
Cross-platform messaging is a mess. That is, sending a message from an iPhone to an Android phone, or vice versa, still doesn't work right. Want to create a group chat or respond to messages on your computer? Good luck.
One solution would be for everyone to buy Apple products. That's not realistic, and it only rewards bad behavior; Apple's “our way or the highway” attitude is the reason this is so bad in the first place.
Another solution? Use Signal. Seriously. Just use Signal. Get everyone you know on Signal and never look back. It's time to text like it's 2023.