Haha ! I like it very much
Although it is true for the 7E7, that it is a completely new, while the A350 is built like a LEGO toy, but Boeing also used previous designs and aircraft parts in its new aircrafts...just remember to the longly seen 727 nose that was transformed into 737 later, or the 767 nose, or the 767 engines that appeared on the new 747 etc... And just check Embraer: all of their airplanes uses the same nose and fuselage section

...does not matter if it is jet or turboprop. That is normal in the most cases.
The only difference is the Airbus answer to the 7E7 (or 787) is laid on a different thinking. They need to do something really fast now ! So fast, that they applied around 500 new engineers to the project. (I was almost enter the project too

) And if you need a so fast solution, you cannot design everything from the beginning. I feel that the A350 is a "just let it be, so the costumers can choose from another brand" kinda aircraft, while the 787 is the result of a long, technolgy development process.