Ok, I'm sorry I only skim to the last of your paragraph but I can't stop laughing. FYI, perspective is determined by the distance to subject. Focal length only affects magnification.
LOOOOOL ok, then I dare you, Stand 10m from a subject, shoot at 70mm. Now shoot at 200mm. Then still say that the focal length did not impact the perpective at all. I can't stop laughing at your nonsense!
FYI, it is a well-known fact that shooting at longer focal lengths will give you a tighter perspective, making the background appear larger in the frame, while shooting at wider angles appears to push the background away.
Geez, you're not getting anything right today, are you?