In any form of expression driven by public participation and desire for an audience, trends will develop. Whether you're talking fashion, artwork, music, slang, marketing, social media, scientific inquiry, or any number of other dynamic human forces, popularity and the desire for approval will affect what direction expression takes. One of the biggest areas of social life where trends can and do take over is in storytelling.
When it comes to setting and tracking writing goals, many of the websites and apps I've come across allow writers to measure their progress only by way of word counts, and while numerical word goals may be useful to many writers, I find it very narrowminded to limit users of these apps and websites to measuring progress via only word count. There are many goals writers may want to set and many types of writing where word counts will not provide an efficient way of tracking progress.
Beginnings are hard. For me, one of the most difficult parts of writing a first draft is deciding at what point I should start my story's timeline. What opening scene will catch a reader's attention? How early is too far from the action, leaving them bogged down with mundane character introductions? How late into the action will leave them confused rather than engaged? Is it worth throwing in a prologue to give readers background information, setting the backdrop of future events? Or should all of the pertinent background information get woven into the storytelling as exposition?
One of my favorite parts about starting a new writing project is doing research. My writing consists primarily of fantasy, and this allows for a wide range of research directions. Much of what I look into before starting to lay out a plot deals with history of technology and daily living in order to make the setting and characters believable. Sometimes during the course of this research, I'll run into some, little factoid I never considered significant before, and it will lead me down another trail of exploration that has significant impacts on my plotline.