Board Thread:Support Requests - Getting Started/@comment-14779707-20130828172140/@comment-188432-20130904155730

Oh, and you possibly don't want to encourage people to use HTML in wiki editing because when tags get deprecated, like several did when we made the jump to HTML 5.0, you have to go through a lot of fiddly re-editing to change things. Best to encourage the average user to stick to wikicode, because that will always be right.

(Yes, I know, there are some cases where you'll want to use HTML to build templates. But most average users don't mess around with templates. And even if they do, a single problem in the template namespace is easier to remedy than a lot of raw code in the main namespace.)