Chemistry can make a relationship begin.
Compatibility decides how expensive the relationship becomes when real life arrives.
You can have extraordinary conversation with someone whose financial habits terrify you.
You can have intense sexual attraction with someone who wants a completely different future.
You can laugh for hours and still be unable to resolve conflict without damage.
Chemistry is important. It is simply answering a different question.
Chemistry asks, "Do I want you?"
Compatibility asks, "Can our lives work together?"
The two questions overlap, but they are not interchangeable.
Strong attraction often makes early differences feel small.