Imagine every day, your muscles get just a little bit weaker. Maybe you can’t open a container you used to be able to. Or you find you can’t lift your arms high enough to shampoo your hair anymore. No matter how much you try to exercise, it never helps. Pain sets in due to incredible stiffness. Your fingers start to curl up until they are nigh unusable. Entire limbs become gnarled.
Eventually you lose the ability to walk. Then speak. Then eat. And finally, even your breathing muscles become so weak and paralyzed that you constantly aspirate due to your inability to cough. Recurrent infections set in. Then you die of respiratory failure.
Only once you have symptoms is it too late.
You can have it for years before symptoms appear, though the average is two months. If you get vaccinated before then, you’re good.