Again, "desirable" is always subjective. If you like the sound of the speaker represented by the green curve above, odds are that you'll like the sound represented in the red curve somewhat less, if at all. It will be both muddier and harsher. Additionally, it can't be equalized to recover the IR represented by the green curve.Not questioning whether a reflection-free NF IR would be different. More a question of why it would be more desirable than one captured using typical recording techniques.