Common theme: Association autosave rough edges

https://discuss.rubyonrails.org/t/build-association-silently-deletes/74358/5 https://discuss.rubyonrails.org/t/quirky-has-many-through-behavior-when-creating/74372/4 https://discuss.rubyonrails.org/t/invalid-belongs-to-association-silently-returns-nil/74585/6

I think the WTF about form objects may also fall into this category. In a Rails context, form objects are in large part a response to people not knowing about or not trusting autosaves.