Actually, that's an interesting point.Helmut Von Moltke wrote:...Goering wanted to imitate the Waffen SS, trying to create a Luftwaffe ground force...
Whilst the wisdom of forming a separate army in the form of the Waffen-SS versus the realtive utility of diverting the resources it took to do that from the Heer can be debated, I think we would all agree that the Waffen-SS did in fact succeed in creating a fair number of high quality combat formations.
And they managed to do this in a "new" organization they created for themselves.
So why did the Luftwaffe's efforts to do more-or-less the same thing fail so dismally?
- they started later?
- they had fewer cadre personnel trained/experienced in ground warfare?
The Waffen-SS started back in the 1930s with the LSSAH and the V-SS, both of whom trained for ground combat for years, thus developing a cadre of leaders. Also, a number of those SS personnel came from the Army in the first place (eg Hausser et al). These early formations then gained combat experience in the opening years of the war. The subsequent expansion of the Waffen-SS was based in large part upon cadres of veterans drawn from those successful and experienced formations.
It should be noted that other Waffen-SS formations (eg Totenkopf), not formed by this process of "organic expansion" leavened with combat experience, were not considered so successful.
So perhaps the problem with the Luffwaffe field divisions is that they tried to create too quickly from scratch, with no experience base to draw from, as compared with (the successful parts) of the Waffen-SS?