The idea with a windage tray is to prevent the rotating assembly from picking up the oil in the pan. A spinning assy works like a suction pump in the block, as Smokey Yunick proved decades ago: it pulls the oil up and creates a "rope" around the crank & rods.
Scrapers serve to break up the suction, as well as stripping the spinning oil from the assy.
Even just a deeper pan helps, as it can be used to keep the oil further from the crank.
Drainback on sheet-metal trays can be assisted by directional louvers or using a mesh; the stock stuff is lacking in that regard.
Obviously, ensuring the pickup is ALWAYS submerged in oil is vital.
I've even seen the benefits of adding a deep pan & tray on a car hauler, where it improved the life of the big-inch, relatively slow-turning (rarely over 3000 RPM) engine. Add in higher RPM, launches, and hard braking that the truck didn't see...