They did that by design............they want you to pull the pan so you go ahead and change not only the oil but the filter too. Some aftermarket pans have plugs, but only to eliminate the mess. You still need to drop the pan each time to change the filter and look for any signs of problems.

Little tip........remove most of the bolts except ones on the four corners, then as you loosen them tip the corner of the pan down and start spilling the old fluid into a pan. Then when you remove the pan it will be less full.

Don