Why does HTC post screen shots up to 10 days before a new release?
Lets see hmmmm, Yak cockpit didn't have the HUB cannon manual cocker handle pull extending between the pilots knees. Now you see one in every yak cockpit ripe for the yanking......yeah Waffle, I know, who wants to look down between their knees all the time at their large cocking handle.
What happens in the first week after a new ride is released in the forums?
Everyone with an ax to grind tells Hitech exactly how dumb his choices of performance and everything else is. Sometimes a patch is released within 24 hours with ahem...player suggested choices....

Or up to several months later with the help of very dedicated players digging around in manuals.
It's up to you to contribute. Some art changes only before the release after inspecting the preview screen shots. Performance changes after the release along with some art changes if you find something documented that's really obviously a whoopsie kind of over sight by the team.
I know of a number of gunsight issues that probably will never artistically be addressed. On the other hand in the Typhoon, the reflector plate mask sits on the pilot side of the collimator lens standing at 90 degrees versus 45. You can see this from F3 mode zoomed into the side of the cockpit. Or in the F4U-1 the collimator lens doesn't render below the reflector plate at all.
Maybe when the Tempest is updated Waffle can fix this oversight with the Typhoon. Tempest and late Typhoon like in the game were issued the Type I Mk III which had no reflector plate projecting a dot on the inside of the armored screen. This was as a result of the Beaumont modification of the Mk II to reduce glare for rocket firing.