If your ways are working for you then you should stick with them. But the marketplace is changing. Look at what has heppened to sources and displays, look where content is going. Don't be a dinosaur for too long or you'll join 'em!

BTW, interesting examples you gave. You could do everything you cited, charged the same and your cost (in both labor and materials would have been considerably less). You could make more money.
But bottom line, if you are making money, good on ya! May you keep doing so.