I have used many techniques in Siril and Seti Astro Suite to create many awesome astro images. These two programs are constantly improving! Which software do you use for astrophotgraphy?

It also has steps out of order (gradient removal is done first), and doesn't even talk about linear/non-linear edits.

Highly recommend picking up pixinsight and a book on how to use it.

Bona fides: I'm an astrophotographer, you can see my work in the link in my profile (not posting it here because I'm not trying to promote it).

What I would've found helpful would be a discussion of proper exposure for astrophotography, which oddly enough was missing. If your exposure is screwed then your edits will be screwed too. They mention pulling back the star highlights and boosting darker areas, well it would be interesting to hear the author's opinions on the optimal exposure settings to enable those edits without excessive noise or clipping.

Also my pet peeve, getting colour science technicalities wrong. "RAW files are dull" no RAW files are simply not viewable as-is and any attempt to display them without proper tone mapping is pointless. "Linear image" - what does this even mean? No respect for the colour pipeline :(