Granted, some people overpack. Others are going places or doing things that require a lot of gear. If someone is willing and able to push a loaded bicycle over a pass, then I say they get to take whatever they want. I may not agree with their choices, but then they wouldn't agree with mine. To each his/her own.

Are you looking for ideas? Or, are you trying to suggest something about people who tour with heavy loads?

I pack

3 pairs of bike shorts
2 biking shirts
a fair number of tools and spare parts
Cooking equipment
camping equipment (includes a camp chair)
Off-bike clothes (pair of pants, socks, lightweight shoes good enough for hiking, cap, fleece if going to colder weather)
rain gear
entertainment (iPad or books)
camera and iPhone
Toiletries
Food (fresh vegetables, snacks, spices)
Water (I wear a camelback)

This requires 4 panniers with sleeping bag and tent on rear rack.

On tours where I won't camp, I don't bring camping equipment. On a rare, short tour, I might leave cooking equipment at home.

What do you take that is different?