I started life with a cruiser and electric hub. I knew I had a problem the first time I hit the pothole and all my groceries flew outa my front basket. I installed a ROCKSHOX suspension fork, which was the best addition to my bike. I also installed a seat suspension post, which helped also.
Now I ride a Diamondback bike with stock suspension fork, 4.2hp engine and shift kit. Even though I never ride offroad, I NEED that suspension fork for my style of riding.
My riding buddies and I reach speeds over 35mph. We all have suspension forks for ride quality.
My next project is a 29" bike with fat tires, 4.5hp, shift kit and yes, ROCKSHOX suspension fork.