Yeah there is so much more to Mihawk than "what meets the (Hawk) eye"! Ive always found him one of the most fascinating, mysterious and best characters in OP and I'm extremely excited for Oda to finally give him in his time in the spotlight, his backstory, motivations, the history of Yoru and what actually happened on Kuragaina island, if it involves anyone we know like Germa for example.
We definitely need to see Shanks vs Mihawk, it would be a crime for us to never see it, even if its just chapters and not animated, even drawn by someone else like Boichi, give us something FFS Oda! But being animated for a movie would be the perfect situation with that movie level animation and Film Red is that perfect opportunity too ofc! Mihawk was in 3D2Y OVA and Stampede at least so there's hope!