I think furniture assembly is more about being able to work together for a common goal and communicate what you need the other person to do and listen to what they need you to do.

For some reason a lot of people struggle to assemble ikea stuff (I honestly don’t know why, I’ve assembled dozens of items and it’s not rocket science). But there’s definitely been moments when I’ve been assembling some shelf and need my wife to assist with a two person step. If the assembly has been frustrating you have a really good test of how well can the two of you communicate through frustration and work together.

So maybe you are great at ikea assembly and don’t have the frustration factor, or you are a wonderful communicator and listener. For a lot of people though it’s that “this is the 12th step, I’m annoyed because I did the 9th step backwards and had to undo some shit, I’ve stripped this fucking screw… I’m gonna slide this piece and you need to guide it past the shelves, past them, you see how it’s hitting the fucking piece of wood, I need it not to do that!!!”

You probably shouldn’t marry everyone you can build a shelf with, but if you can’t effectively communicate when frustrated doing something trivial like building a shelf with someone you should work on that before tying the knot.