Some ride with all weight on the rear.
Some ride 60%rear 40%front.
Some ride 50-50.
Some ride 40%rear 60% front.

Depends on what a person likes, what gear the have, and how their bike handles.

Some bikes handle better than others with a front load. This is from what ive read and not experience as my touring bike handled great with a front load of probably 70%.

Some handle poorly with a front load due to fork and head tube geometry.



All weight in back, to me, makes for a very easy bike to tip backwards. Ive ridden that way many times and its perfectly enjoyable on relatively flat land. Going downhill or uphill is less stable.