Cardiomyopathy, deep vein thrombosis, pulmonary embolism, arterial occlusion, heart attack, stroke, irreversible destruction of lung tissue, cardiac arrythmias... how's that for a start? Then add all cascading problems each one of these can cause. From The Mayo Clinic: "We're really seeing a number of reports of people who report long-term fatigue, headaches, vertigo (and), interestingly enough, difficulties with cognition, hair loss, cardiac issues, and diminished cardiorespiratory fitness. And I think what we're going to find out is that a large portion ― not all, but a large portion of that ― is likely to relate to the significant cellular-level damage that this virus can cause," says Dr. Poland. This is happening not only to the symptomatic cases, but also those who were aymptomatic or had very mild cases. I hope that helps you understand a bit better.
Well said, but people with zero scientific knowledge will still say you don't know what you're talking about. The Anti-Science folks follow the Anti-Science POTUS pretty strongly.