To prevent their citizens from listening to one man giving a speech, Pakistan needed to organise blocking all access from ordinary customers to the entire Youtube platform.
That's the smallest thing which works. And your reaction is you are sad because of "how susceptible it is to control and censorship" ?
What if Khan instead wrote a letter to a newspaper? Government can just tear up the letter, and tell the newspaper not to publish it - no need to shut every newsagent and corner store in the whole country. Or if he wrote a book? Government just orders the book pulped, there's no need to shut libraries and close every bookstore.
The minimum effective action was to completely cut off their country from this invaluable resource, loads of Pakistanis who had no intention of viewing the speech are now aware because their favourite clip of a guy getting kicked in the nuts was blocked, or the pop video they liked, or a defence of their preferred way to make a common snack. "Hey, why doesn't Youtube work?" "Oh the government are censoring Khan".