The bad thing about non power beyond plumbing is that if the next valve in the line is operated, the line between becomes pressurized and if the first valve body is used, its cylinders will be trying to dump against pressure instead of draining freely into the reservoir. Most simply, The pressure would be equalized on both sides of the piston, so the cylinder could not move. I could imagine even weirder things happening if the downstream valve body is regulated at a higher popoff pressure...
The "wrong" way was pretty common however. You can see all kinds of older tractors with only a simple in and out add on valve upstream of the factory system. Obviously It worked despite what hydraulic experts today say (i'd follow power beyond advice for new installations). I don't think the real need for power beyond came about until implements and attachments started having more than one hydraulic line/pair. You were using one component or the other, not all at the same time.
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