Nobody cares about it? What do you think about that?We discussed this previously (I don't find the respective thread atm). It was changed with Whonix 7 to make it more user/newbie-friendly. Personally I feel just the way you do. You outlined some reasons for your opinion already. I'd like to add, that a bloated Gateway highers the attack surface significantly (which somehow seems to be kind of a contradiction with Whonix' goals to me).
Anyways, as Occq already pointed out, you may build a “hardened”/minimal Gateway from source still.
Not sure if a continued discussion about the matter is appreciated? If it actually is, taking the opportunity, we also could continue the general KDE bloatware/resource-hog discussion btw 
Edit by Patrick:
attack surface addressed here Why is the the gateway image almost as big as the workstation-image? - #4 by Patrick