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Lower pressure means the suit uses pure oxygen unlike the habitat module.
And pure oxygen means the astronaut has to do hours pre-breathing before wearing the suit or they will be stricken by The Bends.
This is why high-pressure space suits are called "zero-prebreathe" suits.
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.
Ever since NASA has avoided using pure oxygen atmosphere wherever possible, which means using high-pressure.
The problem is if you go from a high-pressure environment (like a habitat module) into a low-pressure environment (like a low-pressure space suit) you run the risk of the bends.
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.