Not sure if I used the correct terms but what is the difference in security and privacy between downloading from a public wifi (or a closed wifi; with password) and mobile hotspot (sharing 4G/5G data from your phone to your computer)? Which one is recommended or does it not matter?
Client separation on WiFi is supposed to force clients to only talk to the AP and prevent them from talking directly to each other. The motivation is to allow the AP to enforce appropriate policies.
The feature may well be as antiquated as WEP now, it’s been years since I looked into how it actually functions.