Why would tapering be a problem? I joint the face, joint the edge then
rip to width.

If the board is narrower at the ends than the middle, when you're
edge joining it you need to feed it so only the middle is cut for
the first few passes...otherwise the board will taper from one end
to the other.

In general, nature does not make boards that look like that. 99% of the time
if a board has a convex edge, the opposide edge is concave.

Joint the concave edge, then rip the convex edge.