Incidentally, this client isolation thing can be extremely annoying in practice in networks you do not control. Hardware device makers just assume that everything is on One Big Wi-Fi Network and all devices can talk to all other devices and sing Kum-Ba-Yah by the fire.
Then comes network isolation and you can no longer turn on your Elgato Wi-Fi controlled light, talk to your Bose speaker, or use a Chromecast.
Then comes network isolation and you can no longer turn on your Elgato Wi-Fi controlled light, talk to your Bose speaker, or use a Chromecast.