The lead time for HTML is close to zero. Persistent Most broadcast media are ephemeral. News magazines are on the news stands for a week News papers are on the news stands for a day News casts are on the air for an hour Ephemeral media do not support reflection or analysis. It is difficult to hold candidates to their words, when their words are already gone on the wind. Discourse is reduced to dueling sound bites.
Web pages are persistent.
It isn't enough for them to look good, or sound good. They have to stand up to scrutiny and criticism. Active TV is a passive medium. Viewers sit in front of the screen while sounds and images wash over them. The broadcaster decides what they see and when they see it.