I normally like these write ups but this one...I'd agree with it when pushed into general use but the Champion's intended roll isn't to rush in and slug it out. It's intended role are heavy reconnaissance and fast strike missions. In those missions the weaponry and armor makes more sense.
The LBX has twice the range of the ML and SRMs. That keeps recon hunters at a respectable distance. It also allows the Champion to open up and exploit holes in its enemies when it does rush forward to strike it's enemies. The other weapons aren't there so the Champion can slug it out with the enemy but to finish off enemies that are already damaged. And when used like this the 8 tons of FF Armor isn't bad. Yes, there's better configurations but for these missions I think it works. Its when pushed into other roles that the weaponry and lighter armor become more of an issue. But it still works if it hangs back a little to support the rest of it's lance before charging in.
I do agree that the Champion looks like it should have jump jets. Swapping the LBX for a PPC or ER PPC, does leave room for 4 jump jets and an additional ton of armor. DHS would take care of the heat build up.
I think the oddest thing about the Champion is that it's competitor was the GRF-3N, which isn't introduced for another 491 years.
A Champion with a Partial Wing would make a more functional jumping variant than the Champion LAM. I still love the Champion LAM though. I'd swap its weapons for Clan tech and install a ILL or ERLL for a long range punch in keeping with the original Champion though.