Do you really think that one device will satisfy all your needs? If you are a faculty member, spend your grant and get a proper computer with a large monitor (for your primary machine) and a laptop (for traveling , meetings and/or teaching).
Besides, iOS does not allow the use of citation software for "cite as you write" integration with Word.
iPad or iPad Pro should only be considered as a third device. I have one and do use it often in meetings and teaching. However, the key here is "often", not "always". In many cases, iPad is not sufficient for all the tasks I need.
You are wrong. Endnote on iPad allows the insertion of "temporary citations". You can do all your work on the iPad and when you are done, just open it for two seconds on the iPad to insert the bibliography section.