Why does a Snowflake proxy benefit from being behind a nonrestrictive NAT?

I thought the idea of Snowflake was that it uses WebSockets, which I thought meant that it didn’t matter that my router doesn’t currently do port forwarding. I still get Snowflake clients connecting to my Snowflake extension in Firefox, so clearly it works without it. But on this webpage from the Tor Project it says that standalone Snowflake proxies are more reliable options for users behind restrictive NATs and firewalls. Why is this the case?

Turns out the situation was more complicated than I initially thought. I found this wiki page explained everything.

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