Tri Motor and Misdagain are completely correct.
Deep stall was never an issue.
And there were loads of silly landing techniques and myths as to why.
You had to watch you sink rate carefully, if you let a high rate develop you did need power and lots of it quickly.
However, you could flare and land normally with idle power, and this, as with most jets is optimal.
F40 was blocked at my Airline and most US operators.