It's not weird at all. I've preserved the original map and made some changes such as narrowing rivers and added extra cliffs here and there. I'm too lazy to terraform every inch of my island.
That's completely normal... I mean, this is a game for you to escape and shape it the way you want and feel comfortable in I didn't change much of my island either. First, it started to be too stressful to try and change everything and second, I love the natural look of the island! I've change the rivers a little bit and dug up some secret spaces on the mountains but that was it.. And I love it