[jph]

Quality can be much better with these kinds of templates and frameworks, because the creators can make better default choices, and generally can be aware of more corner cases, compatibility goals, integration testing, and the like.

For example, Avo (https://avohq.io) and Bullet Train (https://bullettrain.co/) are IMHO higher quality than what a typical intermediate developer could accomplish in weeks of full time learning and coding.