+1 for Obsidian fixing this issue.
Not only are new windows less functional than the original window (the first-opened Obsidian window), but it also causes some plugins to break across windows/virtual desktops. Eg: there’s a plugin called Typewriter Mode which can’t work across virtual desktops (on MacOS at least) because of this weird Obsidian window design.
This seems like an issue that really needs to be fixed by the core Obsidian team since it can potentially affect any plugin.