TV shows premiere were nothing new. Though in the past, only movie premieres would be given importance.
But as time went by, the TV shows had gotten a lot of following and some of them were even more popular than blockbuster movies. This has been strengthened by the rise of streaming platforms.
The idea of binge watching a whole series was a great one and unlike shows on television, they don't have to wait a week for new episodes. Due to this, it had gotten a lot of popularity.
Even then, there was a lot of difference in premiers. Small series won't get one as the media won't be interested until it has gotten a lot of buzz from the audience. Thankfully, [Sherlock of the Shadows] was the opposite of it.
It was Zetflix main series at the end of the world and they wanted it to be big, so everything was grand.