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Low pressure means you have to do a few hours of pre-breathing or the suit will kill you with The Bends.Which is a problem if an emergency strikes and you don't a few hours.

It would be the outer-space equivalent of those stubborn elderly hospital patients who insist on smoking cigarettes while wearing oxygen tanks. NASA tolerates low-pressure pure-oxygen pressurization in their soft space suits because they have no choice.

There is not a lot of research, but NASA seems to think that if an astronaut in such a suit got punctured by a micro-meteor and it caught fire, the main hazard is a fire enlarging the diameter of the breach, an astronaut-shaped ball of flame.

Hard shell space suits advantages are: they can use high pressure atmo so you can't get the bends, you don't need to pre-breathe, and you'd need a freaking handgun to puncture it.

Disadvantage is they are monumentally overwhelmingly hideously encumbering like wearing a suit of medieval plate armor made out of solid lead. Semi-rigid space suits are a cross between soft and hard shell suits.

Soft space suits are only terribly encumbering, like wearing three snow suits at once. Disadvantages include the fact they can be punctured by a pair of kindergarten safety scissors, causing certain death.

Oh, and they can only use low pressure because high pressure will make the suit spread-eagle you like a Saint Andrew's Cross.

This is why high-pressure space suits are called "zero-prebreathe" suits.

I suppose some space-faring nation could use low-pressure pure-oxygen habitat modules to avoid pre-breathing with low-pressure space suits, but that would be insanely dangerous.

They are only used as a precaution, worn inside the habitat module during times when there is danger of it springing a leak (such as during lift-off).

Full-(Body) Pressure-suits can be either Low-Pressure (pure oxygen at 32.4 k Pa) or High-Pressure (breathing mix at 101.3 k Pa, normal Terran atmospheric pressure).

The accuracy of space suits in science fiction was very much hit or miss.

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