If you have any crab in equal to the amount of crosswind, day five degrees, the instant you reduce to 4.9 degrees with the wings level the plane will start to drift. And it increases at 4,8, 4.7, 4.6.... The decrabbing isn’t instantaneous. And your technique assumes you can also coordinate reaching touchdown point at the exact moment that you instantaneous go fly your crab angle to runway alignment. That’s impossible in real life. I’d love to see someone try that in 25 kt crosswinds. Wait a second...I have. It’s not pretty.