You can use the Instagram phone app on the iPad though, I do. It’s scaled well for iPadI only use my phone at home for instagram, as I still dont understand why it isnt on the ipad.....
I will be comparing the mini and 12pro to make a decision - no rush at all given my 11pro is still tip top and I have barely left the house in the last 112 days.

If I had an 11 Pro, I wouldn’t even be considering upgrading personally. The differences must be absolutely minimal.