That'sinteresting. Do I take it (flags are not my strongest subject!) that we're talking about Lithuania? If so, do you know whether that is also the case in your neighbouring countries?
That's a credible explanation. However, in turn, I have no idea as to why inward opening external doors seem to be almost the norm in the UK (even though my front door opens outwards!!). I suppose one possible reason is that the inside face of an outward opening door could get wet when opened under the appropriate weather conditions - but, conversely, heavy snowfall might prevent one opening an outward-opening door - so I don't know

However, Mr Google's "AI Overview" seems to agree with your suggestion about your country (and also my point about snow) ....
Up to a point, but I'm not sure that makes much difference since, even if the door opens outwards, the interior space immediately inside the door becomes essentially unusable (for a wardrobe or anything else).