Yeah, shawn...seems like you're getting carried away, but what you're saying has truth.
A, you're correct in that 6061 is far weaker than the 7075 links which is why noone uses it anymore.
C, a big problem in the al links is the fact that after one trail run you will have some beautiful .5" gouges down the bottom which can lead to problems.
That being said, rob E. used 2" 6061 links back when it was a new thing and there were problems with bending (pretty often), gouging, and at one point the pinion touching and chewing up a lower. So he switched back to DOM lowers and no more problems. We also discussed al links with plenty of builders/competiters at the time and everyone has an opinion. 7075-t6 is quite a bit stronger though so I guess it's a moot point. Either way, I would personally run steel, especially on a heavy rig...but Al links have been done before and have worked. They can also be polished up all prettily before your favorite car show
It just doesn't last long.
IMO a big plus to Al links is being able to have a large link and still having the ability to tap it for whatever sized heim you like.
...almost getting to the point of the pipe/tube debate.