Unlikely it was get more supple as the sides are squared off like the 12pro and pro max.
I have the official leather one for my 12 pro and it is a bit difficult to hold as the sides are reinforced to protect the sides of the phone.
I’m not sure any other case will be any better as it’s the phone itself that has the squared off sides so any case will have to take that into case.
Maybe a wallet type of case might suit you?? Apple do a leather wallet type of case buts it’s pricey.
iPhone 12 Pro Max Leather Sleeve with MagSafe - Baltic Blue
https://store.apple.com/uk/xc/product/MHYH3ZM/A
I have the official leather one for my 12 pro and it is a bit difficult to hold as the sides are reinforced to protect the sides of the phone.
I’m not sure any other case will be any better as it’s the phone itself that has the squared off sides so any case will have to take that into case.
Maybe a wallet type of case might suit you?? Apple do a leather wallet type of case buts it’s pricey.
iPhone 12 Pro Max Leather Sleeve with MagSafe - Baltic Blue
https://store.apple.com/uk/xc/product/MHYH3ZM/A