Water will drain from a flat surface. The reason to slope it is to be sure it doesn’t slope the wrong way.

All and all there is a code for most stair/step rise and depth so does either you'res or your contractors meet those guidelines?

It needs to be a little more complex than what you've shown. Yes you need slope and 1% is bare minimum. The top edge of each step should be level. There should be a high point where the walk meets the edge of the house and there should be slope (imagine a cone) from that point the the top step edge. The rest of the stoop will be a plane at 1% slope. Make sure each step has a little slope to shed water.

Put in a ramp.