Both calibers are powerful enough to require locked breech design handguns. Yes - a few unlocked breech guns have been made, but they are impracticably heavy. Think "Hi-Point" in 9mm.
Smaller calibers starting with the .380 acp have been widely produced with unlocked breech designs, and some of the modern ones appear to be very cheaply made. For example, one of my students brought a brand new M&P .380 Bodyguard to class, and it promptly locked up after about 4 shots. Something in the mechanism failed internally. It was a qualification run for CCH permit, and we loaned the student a replacement firearm in 9mm.
I don't have a problem with older all steel guns that are in the smaller calibers and have unlocked breech designs. The Walther Suhl, Ulm and Arkansas manufactured PP and PPK are good examples of well made guns.