Round table

I had to speak again about those oneway portals. I understood that there are opinions about their utility, please tell me what good things can bring those portals to the game. It happends to often that a unique road to end in a oneway portal and if it is an exit it is very painfull. And this also happends very often on sand, swamp, snow or rough and the other part of the portal is very far (maybe days to reach it). This most of the time is a lost game and not only for players of the same skill.