I couldn't teleport back to the other ones and the game told me that I haven't found other waypoints which was not the case. It seems like I can only teleport to the waypoints I found once unless I interact with them again?
=> This is not intentional. More like bugs. But I'm not sure if this is exclusive to Mac version or if someone on Windows have the same problem, I'll need to look into that further. Did you load save files between the two teleporting times?
EDIT: I've found the cause of this bug!!
As for the meter, yeah, good point... Should probably make it run much slower.