I can sort of understand the frustration with only using terminus, it's a bit more difficult for new riders and tourists.
There's only two systems outside the GTA (AFAIK) in Canada that regularly include a direction with their wayfinding and not just terminus, the O-Train and the C-Train
Ottawa always includes the direction, and usually which way is towards downtown
The C-Train uses inbound and outbound, and only uses terminus on the outbound, and "city centre" as the inbound destination. I like this system it makes it clear which way the user should be heading