floor- or shower drain
kd
seems to me you keep asking two independent questions simultaneously every time.... every post confuses me.
1. Yes, a floor drain is a good thing, and is way better than a pan. I have floor drains.
A floor drain that is going to be used more than just for an emergency, is a shower drain. Needs waterproofing around it, on a slight slope too.
Why waterproof? Otherwise your floor rots, even if it is made of concrete or tile, since dirty water percolates through grout and stagnates under the tiles, or percolates through the pores in the concrete, even if the concrete is sealed.
Why on a slope? So water runs, trickles, slips and slides over to the lowest point, the drain. A shower drain is made to accept the bulk of the water through its visible top but also to receive a minute trickle of water that has worked its way under the floor's top layer of tile.
btw, according to code a floor drain in a bathroom is to be waterproofed and sloped just like a shower drain.
2. Whether you can officially or wisely send your drain water down into the ground, is a second concern. A different problem.
I wouldn't do it.
David