@forteller The new system does a whole lot more than an icon on a panel. And it is likely to do even more in the future: https://gitlab.gnome.org/Teams/Design/whiteboards/-/issues/272
Sorry that we don't want to stick to Windows 95's limitations, but this is no different than apps being expected to respect the modern light/dark mode standard, the XDG user directories standard, the screensharing/webcam/microphone portals, the power management inhibition API, etc.
They need to get on with the programme. File tickets on those apps.