[gjm11]

I would say "Thank you for reassuring me that even though this is a problem affecting my heart, which on the face of it sounds super-scary, it actually isn't all that threatening". (Well, probably I wouldn't be so explicit, and probably I would first ask some questions about what they meant by "passing nuisance". And I might be annoyed that a medical professional treating me was using dismissive-sounding language about something I found distressing, but obviously that particular annoyance isn't relevant when it's Some Guy On The Internet talking about it in the abstract.)

[headsoup]

What if you knew myocarditis could have a risk of complications and your doctor said that? Wouldn't you prefer the doctor said 'generally it's temporary and will go away, but there are some potential complications and you should monitor for the following...' You shouldn't have to ask questions for that.

The way people are now happily accepting hand-waving away heart damage because someone said 'hey it's fine' is astonishing. I do truly hope it is a mostly transient issue, because we haven't done the long term studies yet.

[gjm11]

Of course I would prefer my doctor to give me an accurate account of what's wrong with me and what its likely consequences are.

We are talking here about some guy in a brief Hacker News comment, talking to some other guy on Hacker News. The level of detail it's reasonable to demand is not the same in these two cases.