Insulting people hardly helps. It is quite possible to go on a week's business trip without taking checked luggage by packing appropriately into a rollaboard carryon; not eveyone needs to check the kitchen sink in.
Again, it would seem that for your personal requirements, JQ will not be the best choice of airline and one of the other options may well be suitable. There are others who would not fly Jetstar economy and would pay the extra for a full service airline in economy for other reasons.
For a premium cabin, JQ's price is $2800 vs $7800 on HA . How much better HA's business class is I am not sure, but I doubt that I would be likely to value it as worth $5000 over JQ.
Different people have differernt priorities on what they look for and for those that want to take large amounts of luggage , JQ is not the choice
Others who may be focused on price may decide that 23Kg per person is quite adequate and in general , evidence would suggest it is given that 20Kg *is* the standard allowance for economy class in most of the world
When I travel to UK, for example, I have a wide choice of carriers. If I need to take large amounts of luggage then I would choose BA for the part of the journey that has the luggage requirements since they allow 3*32Kg in 1st plus an extra bag , if needing more, is GBP72 whereas Qantas would be 40Kg plus 15Kg status bonus and most other carriers allow 40Kg
If not taking large amounts of luggage , then I would take an airline such as CX which has, imo, a much nicer product than BA and am considering given EK a try this year
It is a case of horses for courses. Just because an airline's change is bad for you does not mean that it is bad for the airline. They may , for example, be able to sell more cargo space which is quite profitable
Dave