Um. ...as other posters have said, seemingly healthy people can die of it, or at least end up in hospital? 
I've been unwell for 7 weeks with COVID-19 symptoms. I still have a very bad cough as well as a temperature on and off. I've also had times when I've struggled to breathe. Believe me, it's been horrific!, and it really isn't something you would want to suffer from.
Quite apart from myself, my DH has asthma and my DM/MIL are 80/79 respectively. Yes I know it can be mild (my DD2 (8) had it for 4 day(not tested but I really do appear to have it and I could only have caught it from her. She had a high temperature, chest pain, bad headache and was achy all over. But she was thankfully fine, apart from passing it to me!
I hate hearing it being spoken of as 'mild', there really is no guarantee it will just be like a cold. If you think of how flu feels like (a lot of us have had bad bouts of that when we couldn't get out of bed, then you might realise that it really isn't like having a cold. You really can't predict how it will affect you.
Finally, I would really hate to think if passed it to someone who went on to die from it.