How important is short-form content for long-term growth?

Short-form and long-form are two different beasts. The audience you gain from Shorts won't always care about your long-form content. So it's not a must-have, but it's a good bonus. Shorts can bring in subscribers fast and create momentum. But if you're focused on long form, those subscribers might not stick around. So it depends do you want quick reach, or deeper engagement with fewer people? Ideally, you balance both, but know what you're aiming for.