Friction in design can be annoying – like those interstitials while trying to read a blog post, or being unnecessarily cross-selled while checking out your online cart.
But there can be times when you wished you were warned before you performed an irreversible action, or you regret not having gone through that friction for better security in exchange for ease of access.
At the end of the day, it’s a matter of removing unwanted friction while embracing good friction.