I use my golite/Jardine gear when bike camping, and generally don't carry all the electronics etc... that others do. I do think bike touring is different to some minimal degree for two reasons:

1) One is packing for two. I have my needs, but so may my bike. It needs tools and extra parts, and while I have that whittled down as much as possible it still ads up. Also some of the carry options like panniers and racks are real heavy, somewhat stupid heavy actually. They can be dispensed with, but I like them and they become necesarry at some level of bulk.

2) The human environment is different, this ranges from more water in my case when cycling that when hiking. Where I hike it is shady forest, where I cycle it tends to be wide open to the sun. I also keep the body puring over at a higher rate when cycling, I believe cycling is the means by which humans create the greatest HP output of any sport on a continuous basis. More calories and H2O

I also find the camping environment is different. I see more campsites when cycling, roads tend to more built up areas relative to wilderness areas, and I can cover far greater distances on the bike which leads me to more towns. I would love to do only stuff like the Great Divide (some day), but reality is more people and more worn out camping grounds. Using a tarp above the bug line in a wilderness setting is one thing. But where I bike it better have a bathtub floor, and bug protection to deal with the stealth or worn earth sites. There can also be more different clothes, for instance I have riding and a single set of non-riding clothes so I can travel on trains or again for cities. When I hike that never happens it is all trailhead to trailhead.

Anyway, however one cuts it biking and hiking are different, and bikes carry gear with greater ease, so there is a tendency away from ultralite. But one can just strap a lightweight BP outfit to a rack and take off, like Ray Jadine does. At least if the bike breaks down and you need to hoof it you have your pack all ready.