He does have a point. The border was straight because the people living there mostly (European descendants, the locals were already disenfranchised by that point) didn't give a crap about the border.

I'm Romanian. Ask a Romanian what he'd think about straightening the border around Timisoara, thus giving it to Hungary. Many of those people would die rather than letting it happen. Those borders represent family possessions, cherished childhood memories, remnants of stories past that bond together people on either side of the border, etc.

Normal, i.e. organic borders, are messy and rarely straight.