I think providing opposing characters trying to lift up Hajime in his haze or push him down into giving up makes the dynamic more real and interesting. Simply reading in a game "it was hard, yo" doesn't do the same for me. It functioned in the game as a game scene but the anime took the opportunity to expand on that while weaving the story facet into a greater set of circumstances.
How is Chiaki literally being the most perfect (girl) friend ever conceived, someone who likes him unconditionally and is always trying to expound amazing life changing advice to him, even remotely real or relatable? Same with Juzo with his comedically douchey beatdown. He's even worse. His acerbic behavior isn't even close to being a good enough impetus for his decision to become the Ultimate Hope.
"Go back home normy!"
There's no build up or nuance. He literally spits on him. And then Hajime makes a snap decision after that experience, and it's jarring.
"It was hard yo"
Is a super reductive thing to say. You could literally apply that to any story dealing with internal conflict and make it sound bad.