Most authors at some point write about their process. I've read many accomplished, experienced authors' takes. Authors seem to agree that there's a struggle at the beginning to figure out a process that works for them, and do in fact take the time to tell others what worked for them to help ease the discovery process for new writers.

Here's some examples of famous, accomplished and prolific writers doing what you claim they won't do:

https://www.themarginalian.org/2018/01/18/t-s-eliot-alice-qu....

https://www.masterclass.com/classes/neil-gaiman-teaches-the-...

https://www.inc.com/glenn-leibowitz/the-9-best-tips-on-writi...

You can easily find more by googling for "$author_name on writing"