Cinema has the properties of a finished work made according to the laws of art. TV series are either endless «soap operas» or collections of stories related by the hero. But, of course, it is important who creates the product. There are many artistic discoveries in the best BBC series, and they were made with serious money. And here https://godsempires.com/why-ayaz-ahmed-left-kyy-l-en/ if you are interested, you can read about Ayaz Ahmed.
We also shoot cheap TV shows — one episode a week. And if an expensive project is announced, for example, a historical one, with costumes, then know that the «creators» will saw off half of the budget and put it in their pocket. What kind of quality can you get!
There are artists who do not participate in the series because of internal artistic principles. There are a lot of hack actors in the series, aspiring artists, who are immediately declared stars. And directors often have a weak attitude to the profession.
The venerable «moneymakers»-producers do not take, because they ask too many questions, make demands on the artistic part. The audience has formed an undemanding taste. The point is also the lack of a clear state ideology: in Soviet times, there were ideals and heroes in society. Now they are gone, and criminal stories are replacing each other on the screens, which have already merged into one endless series.