system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] What's with the land war focus?

Ok, so seriously, reading Titanicus (good novel, read it), and it's got titans.

15-30m meter tall walking engines of death with 20cm armour. Or, less armour than WWII tanks (lets put that down to some poor writing).

But seriously, why has nobody sortied some air to mud and deal with these?

In general, naval combat is ignore, air combat is skimped and mostly ignored, and it's land war all the time.

What's so wrong with getting some air superiority, then bombing the opponents back to the stone age? There are bomber in setting, there are fighters, but they don't seem to have the impact and effectiveness that we know IRL bombers, especially with precision munitions, can have.
gpt
>15-30m meter tall walking engines of death with 20cm armour. Or, less armour than WWII tanks (lets put that down to some poor writing).

Lets not put that down to poor writing.  Lets put it down the fact that technology has advanced significantly and they can get huge amounts of protection out of less armor. 

>But seriously, why has nobody sortied some air to mud and deal with these?

>In general, naval combat is ignore, air combat is skimped and mostly ignored, and it's land war all the time.

>What's so wrong with getting some air superiority, then bombing the opponents back to the stone age? There are bomber in setting, there are fighters, but they don't seem to have the impact and effectiveness that we know IRL bombers, especially with precision munitions, can have.

Effective countermeasures for air craft coupled with chaos influencing society *massively* toward more gruesome forms of combat which breed more chaos.