NTSB accident data suggests that pilots who are distracted by less essential tasks can lose control of their aircraft and crash. In light of this pilots are reminded to maintain aircraft control at all times. This may mean a delay in responding to ATC communications and passenger requests, or not responding at all unless positive aircraft control can be maintained throughout. In other words, Fly the Aircraft First!

Fact Sheet: https://www.faa.gov/news/safety_briefing/2018/media/SE_Topic_18-07.pdf