It depends on how you practice Shikantanza. Vipassanna meditation is misnamed, in my opinion, it actually is a form of shamatha. You can't practice insight meditation unless you have insight, something I think not too many people appreciate.
Having obtained the supreme freedoms
and conjunctions of the precious human existence,
endowed with faith, energy, and intelligence,
Having attended on a worthy spiritual friend
and received the pith of the holy instructions,
May we practice these properly, just as we have received them,
without obstacle or interruption.
In all our lives, may we practice and enjoy the holy dharma.