In the 'ole piston airliners of yesteryear, it was more or less common practise to fly thru CB's, if they couldn't be avoided.
Slow to maneuvering speed, and press on.
Then came the early jets.
Up high, they went...and then, just like in the old days, slowed way down, and pressed on...straight into the weather.
Enter the classic jet upset.
On the way down, engines chucked right off the pylon...try explaining this to the fleet manager.
Then folks got wise.
They went around the nasty weather.
Gee, what a surprise....
