The majority of writers in English write books with the expectation that a majority of their readers will be native English speakers. And for the most part, this is true.
The vocabulary of native English bibliophiles is, on average, much wider than the vocabulary of someone who learns it as a second language. This is nothing inherent to speakers of English; almost everyone speaks their own native language better than a foreign language.
Complex plot lines are not unique to English either, but it is more noticeable when you consider the added mental strain of reading in a non-native language. Regardless, there are plenty of authors, as you have found, who will write simpler prose with more linear storytelling. Each writer has their own style. What might be meaningless filler to you could be considered flavourful world building or character building by someone else.
Literature is like food: people tend to prefer food from their culture over foreign foods, and if you don't like certain cooking styles or certain flavours, you can certainly find food that better matches your preferences. And it's also similar to how some people think rice is flavourless and boring while for others, it's an integral part of the meal and it would not feel complete without it.