I tried LeoCAD the other day and found it a nightmarish interface. I've been trying to convince a friend who enjoys building to find a cad program to make sets

I tried LeoCAD the other day and found it a nightmarish interface. I've been trying to convince a friend who enjoys building to find a cad program to make sets in, and Leo promised export functionality. We quickly ran into issues where parts do not automatically snap together and do not move correctly (a part required 1/4 offset and only 1/3 offsets are provided). When we exported our models to another Lego cad program, the new program tore our models apart, finding issues with almost every piece (due to them being partly inside each other or other things). My friend is an engineer who is very used to CAD software, but struggled immensely with the features provided in the package. This pains me because I was so excited about it being Open Source. Edit because my post sounded confrontational: I desperately would appreciate tips as to what we may have done wrong, our struggles in placing flowers on a baseplate compared to the models LeoCAD claims to have produced means we must have been messing up really bad.