> Those orgs choose WordPress today.
replyThe organizations cited chose WordPress years ago.
Choosing to stay on it is, at least sometimes, going to be a matter of large institutional inertia.
Large enterprises are the last to move on things like this.
The White House website is rebuilt by each administration. So in that case, it was quite a recent decision.
reply> The White House website is rebuilt by each administration.
replyThe Federal government is very large bureaucratic organization with more inertia than most. (And probably long-term contracts in this realm!)