It inherently takes more usable space, there's no design that won't lose space, which makes them impractical in smaller homes. To visualise it, for those living in more spacious areas, imagine a "galley" kitchen: 8 spaces one standard unit size, arranged in 4 on each of two opposite walls, with an aisle in between. One unit may be lost to a door. One must be a hob, another the sink. The hob must not have storage above within 60-70cm vertically, due to fire risk; and limits what may be adjacent as well. A window may prevent the use of some spaces above waist height.

A door that opens outwards uses space that has to be clear anyway because that's where you walk. A door that opens upwards takes space that could have been used for another appliance or storage, or the upper half of a fridge twice the size.

The only way round that would be for it to be able to slide outwards, but that's also inconvenient.

Having said all that, they are a great idea if you have the space.