The main thing holding back software development is source code. And the reason for that is culture rather than technology. Because you aren't a 'real' programmer unless you are typing colorful complex text. That's just what the definition of a programmer is.

However, in most domains, interactive graphical tools have been invented and reinvented numerous times that are more efficient than text-only programming. Those tools remain unpopular because of a cultural failure to recognize that programming does not require colorful text that is difficult to decipher.