I actually find THIS mindset to be the weirdest.
Writing drives good, diverse (in genre and style) storytelling. Period.
The problem, of course, is that writers are basically told not to do their jobs nowadays -- in part because they're so undervalued.
Comics are essentially just words and pictures used to tell stories. At one point, there was a much bigger drive to experiment with ways to combine those words and pictures. Words could be big and take up most of the page; pictures could exist without words and tell the story. A Contract with God is an example of the former; there are countless examples of the latter.
In any case, when writing was actually considered to be important, there was a lot more diversity and experimentation amongst all genres and all styles.
Now, the basic assumption is: well, decompression is a thing. So, it's just going to be 4-6 issue storylines until the end of time, so that we ("we" being the publishers) can stick the creators' names on the trade and call it a day. Since everything is so decompressed, writers can (and apparently do) care less per issue, so we might as well dock their pay and give some of it to the artists instead. And, heck, it'll work in our favor, too, since we can hire those writers to write more series and not have to waste time/money on new writing talent.