I've seen dozens, if not hundreds, of pretty simple games, at least if compared to those of the great video game software houses; all of these are predominantly developed with appropriate development tools, which exemplify their creation. There are advantages and disadvantages. It is true that sometimes it is better not to think of the time and effort that our new idea requires us, but to think, for example, of the satisfaction of being able to say, "I did that all alone"?
Furthermore, by storing the pieces of our work so that we can re-use it in our others future works?
If we do it, we do not have to study things done by others, looking for that of we need, by found what seems the same of that we need, to say: "not so bad..." .
We can each time modify, improve and reuse what that it came out of our head. And everyone has his own style.