At home, I usually use a network with YouTube, TikTok, etc. videos. Should Multi-to-Unicast be enabled on Wi-Fi, or under what circumstances should it be enabled?
This has got nothing to do with apps you use. Multicast has a specific problem when implemented over WiFi because multicast traffic must be received by all group members and those may have different connection speeds. Real multicast over WiFi is slow (slowest speed supported by everybody). That one provides partial solution.
In general if you don't know what something does... - just don't touch it.
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But I noticed an increase in my Wi-Fi speeds after activating it.
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That's more about psychology.
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a/ it is possible your network suffers from broadcast storms, like printers discovering eachother or windows network from y2k
b/ unicast demands reply, maybe power saving is sabotaged by replying to patched up packets.
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There are 2 iphone 7 devices on the network, 1 lg smart TV and 1 imac iphone 12 device, when I turned on this setting, there was a real difference, it is definitely not psychological.
You should probably download VLC and try broadcasting some file to multicast group to feel what it's like. Or run tcpdump...
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Question is whether the difference is transfer speed (good, you might be onto the booog) or higher reported link rate (probably you will spend 0.5c/month extra in electricity due to reduced power save)