Are you trying to compare cellphone app development with woodworking or stonework ? It needs more time to be a good woodworker but I think more people can learn the job (you don't need to be literate). Any actual construction worker (and there are a lot more than cellphone app developers) could build with ancient building techniques like vaulted ceilings given time and instructions. It's not a problem of craftsmanship or leverage, it's more a problem of standardization without benefits (I do not think concrete flat ceiling are really less expensive than vaulted for one or two floors buildings, Christopher Alexander reports that they still build houses like this in Mexico, doing vaults with simple crossed wood splines[1]).

[1]: http://www.flyingconcrete.com/vaults.html