Comment by KronisLV

I've seen people who prefer HTML for user-submitted messages and other stuff that might need some formatting - "But what if we need to add colors to the text? Markdown isn't even one coherent standard, there's multiple ways to render it! What about justifying text? What about..." all while fighting increasing amounts of XSS issues and also the HTML style classes (because ofc JS editors add those, instead of even inline styles if you care about portability so much or semantic HTML where possible), as well as inconsistent looks after storing the data in a relational DB and doing various transformations to it over the years.

If you ever hear any of that, don't listen to it. Just use Markdown. If you're building a messaging system or an announcement system instead of a fully fledged CMS - YAGNI/KISS. Or pick anything other than HTML, even BBCode.