Then you didn't try hard enough. Read the Fix your timestep article again, and try again.
Believe me I've tried it with a fixed game/ physics update time of 1/60th of a second, but just didn't work out (after spending days).
Basically almost every game runs on a fixed time step.
Variable framerate can end up in bugs that only reproduce in very specific framerate scenarios, like people going through buildings / invisible walls, game suddenly freezing because an FPS spike (high or low) caused a NaN or similar impossible-causing scenario, bullets that never hit their target, scripted events that never trigger (imagine beating a level but the game never acknowledged the player won, so you're stuck!). The list of bugs that can happen due to variable framerate steps is never ending and insanely hard to debug and fix.
It's a really, really bad idea.