Haha, totally been there. When we remodeled our kitchen, we obsessed over cabinet styles and countertop materials for weeks. Felt pretty proud of ours...

Had a similar experience myself when I redid our basement. Thought sealing it up tight would keep moisture out, but ended up trapping humidity inside ...

Totally agree with you on that simpler solutions thing. French drains are great, but sometimes just tweaking the slope a bit can make a huge differenc...