I'll give you a few examples. I have been using Zapstore for a while and wanted to find the NIP that it uses, because I was thinking about a App Store for Linux using AppImage, I couldn't find it because the NIP is not merged and I didn't know what to search for in the PRs either. I had to manually scroll through the PRs to find it I installed Keychat, 0xChat, XChat and Whitenoise. These use different standards for messages, and it was very difficult for me to figure out which app is interoperable with what