From purely technical viewpoint that is correct and engineer in me agrees with you 100%. However: if you look at the bigger picture you will notice that the fea

From purely technical viewpoint that is correct and engineer in me agrees with you 100%. However: if you look at the bigger picture you will notice that the feature list is not known in advance. Which means the nice abstraction you made are probably unsuitable and will make repurposing software more difficult, not less. Because nobody knows what the end product will look like, so it pays to ship fast, iterate on product design and refactor / rewrite later. But I know what you are saying, I have struggles with that inner engineer daily and he just won't shut up. :)