Why doesn't Sparta measure Landing or have a Landing assessment?

The short answer to most "why doesn't Sparta do ________" questions is usually a combination of practicality and reliability.

During the Jump Scan assessment, our system does capture and store the force data from the landing (for potential future use), but that data isn't currently being displayed in our system for practitioners at this time. The main reason is that the forces measured during landing are unfortunately pretty unreliable unless extremely strict standardization protocols are used and individuals are cued on "how" to land. This is another example of the specificity of reliability: it may be reliable in the lab/research, but that often fails to hold true in the field.
This causes a few main issues:
1. Reduced practicality in testing.
Practitioners need to watch and pay attention to every landing to be sure that it meets the standard to be included otherwise redo the test, ie both feet land at the same time.
2. Decreased validity of the Jump Scan.
By attempting to measure landing data we often influence the jump itself which can alter how force is produced and give us a less valid measure of force production from the Jump portion of the assessment. 
Remember, the more we try to control an individual's movement strategy in assessment, the less valid our assessment becomes at measuring this movement strategy.
We previously utilized a Landing assessment along with Jump, Balance, and Plank in previous years, but unfortunately had to discontinue offering it because the data could not be trusted for interpretation because it was unreliable. The last thing we want is to guide practitioners to make decisions off bad data as there are a lot of negative consequences that can arise there.
The landing forces and deceleration strategy is best interpreted from LOAD variable in the Jump Scan, as this is measured during the decelerative phase of the stretch-shortening cycle, just like in a landing task. A high LOAD tells us a high rate of force and in turn a high rate of deceleration (stiff landing) while a lower LOAD shows a lower rate of deceleration and in turn a softer landing or a better "dispersion" of force on impact. This starts to make a bit more sense as well when we often see more traumatic/acute injuries (ACL, lis franc) with individuals with extremely high LOAD as they are unable to disperse and transfer forces efficiently.
Check out this article to learn more: Load, Explode, and Drive