Apple learned their lesson with the original iPad mini. Go right ahead and update your iPad mini 4.Anyone try iPadOS on an iPad Mini 4? I have some reservations about upgrading since its the lowest-spec ipad supported (A8 CPU). The iPad Air 2 has A8X. Both have 2GB RAM.
I updated my Mini 4 last week to 14.0.1 and the battery does drain a little quicker with normal to heavy use compared to before. One thing I have noticed is that the APP developers are still trying to play catch-up getting their apps updated. Battery drain is pretty much the same on standby.