I finished creating my mesh, and one of the faces looks like this:
But then when I export it, instead it ends up looking more like this:
Now, I'm aware that this face is not really a rectangle and Blender provides a convenient layer of abstraction between me and actual vertices/triangles. But clearly you could have two triangles here instead of ten. How do I get rid of them? If I press "f", they can be merged into a single rectangle, but pressing ctrl+t turns them into this mess again. I tried many things and nothing seems to work.