You might want to read this topic, it has some heated opinions
Some people are uncomfortable with Y axis being flipped, some don’t care, for others it’s actually the right way down. Either way it will be configurable soon.
And yes, do use the stepup plugin for freecad, you won’t have to manually align your models or muck around with wrl settings. Makes exporting models (and few other operations) as easy as it can be.