form tag necessary?

[nerdoc]

@adamghill in many of your examples (e.g. validation, search, etc.) you use no form tag for the "form". HTML specs say that a form tag should be used for data forms. I see that in most cases using Unicorn this tag is not necessary, as there is no form submitting, and data is synced using u:model.
Would you recommend not using form tags at all if not making a classic form? Is it sufficient to just take the inputs and a button, because everything is wrapped in the component anyway?
In your todo list example on https://www.django-unicorn.com/, there is a form tag though.