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There's plenty of precedent for recap pages to have their own subpages.
In this particular case I think it makes a ton of sense since the episodes have (so far) been unconnected.
Found a Youtube Channel with political stances you want to share? Hop on over to this page and add them.Generally, so long as there's YMMV and Trivia items that apply specifically to those episodes, it's fine to have either subpage. I don't think a move is necessary otherwise.
Pinball cleanup thread

What If…? (2021) has two episodes so far, each one with a page in the recap namespace. Those episodes have their own YMMV and Trivia subpages. Is it correct, or should those items be moved to the YMMV and Trivia sections of the series itself?