My guy, ive explained this to you before. Its not about "beef". Its about competing for One Piece. Luffy and Ace for example planned on fighting each other seriously for the same reason. Luffy himself has stated more times about fighting Shanks than he has about Blackbeard lol
And this is me saying this while we have a very basic understanding of what Shanks actually wants. You say theres no beef. We dont actually know what Shanks wants from Luffy. We dont know if its good or bad. And we dont know if Luffy even will be okay with the result.
Aftet this chapter, there is no direct logic where Shanks will act as a "hype tool" for Blackbeard. Shanks has no DF weakness, unlike Luffy, Ace and Law.
Ill also ask you this very seriously: Do you expect Oda, king of short battles and offscreens, to do BB vs Shanks justice if the BBP are meant to fully wipe and defeat each and every RHP commander? He is notorious for hiding characters strengths and fights if they are meant to fight Luffy's crew. Think about this, neither side have truly had the luxury.
There is a reason Shanks and Blackbeards crews have unique designs with 9-10 powerful commanders each. Its not to lose to one another outside of the confines of the story that Oda would even show..