The f4-idea in the London System

This video explores the f4-idea for White in the London System, which keeps an iron grip on e5. White delays Nf3 to play f4 first, or he can play Nf3-e5 and then f4. With this variation, Black often has difficulty finding a plan.
Referenced:
The London System in 12 Practical Lessons amzn.to/3CSypbn
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[@ulrichvansuntum9606]

Nice idea with f3 very nicely explained!

[@OG_Drummer99]

I've been listening to the chess angle podcast on Spotify and heard about this UA-cam page. I also have started playing the London under your recommendation, but I still struggle with middle game strategy. I'll definitely try this f4 idea though.
Please post more middle game strategy content especially for the London system.