If it's mutating, would it be better to get the virus early, before it mutates to something more severe?
While I don't believe SARS-CoV-2 is quite as bad as the media frenzy is making it out to be, it's absolutely a good idea to do everything you can to avoid getting it. The same goes for the flu and for colds. If you catch any of these, you may be OK, but you risk spreading it to people who won't be.
That's ~1 out of every 100 people. This isn't just a media frenzy, by the end of this you WILL know someone who died as a result of (complications of) Coronavirus.
Especially South Korea, which has been very transparent and done a ton of testing.
For virus that can spread before any symptoms and long after symptoms disappear and survive so long on the objects and in the air I think there will be no evolutionary pressure to get milder.
And we can get harsher version just by random chance because this virus is so infectious that it has a lot of leniency whether and when to kill the host.