Why didn't WT use TV?
Because TV broadcasting costs money.
You can bet that the pulishers paid for their own phonographs, just as everyone is to be using an Ipad today, but they have to buy their own tablet.
TROLLEY? The congregation is expected to purchase these and select who stand around talking with them.
BIG SCREENS? The Congregation or Circuit(s) (which means the publishers) had to purchase these for Annual Meeting or Convention broadcasts.
However, TV is EXPENSIVE! It would divert a lot of publishers' contributions if the WTS had to purchase time to broadcast their TV Ministry or if they went all out and purchased their own TV Station -- and that would only be for one market unless there was enough interest for syndication (and that's NOT gonna happen!).
A website is comparatively cheap. MUCH cheaper than printing millions of books, booklets, & brochures. And, it could even prove a means of getting contributions.
Let's review: Follow the money!