Don't thank Boeing, thank your employers (the airlines). When the NG was being developed they wanted it to be like the "classics", not some "new" '90's airplane with all of the latest gadgets. It is nice to know that if you have a total electrical/hydraulic failure that you can still fly the 737.
Same goes for the dual FMC's. Up to the airlines.
Don't knock the plane, it must be pretty good to still be in service and in demand after all of these years.