@Frank-Steven **********
Why do you think someone wants to design a visa that makes it necessary to do a borderrun every 180 days?
It is a possibility because it is complex to find a way to limit the visa, like for instance a Schengen visa where you can never stay over 90 days in a 180 days period.
But this means they have to count how many days you stayed.
It would indeed be nice when free re-entry would be included in non-o.
Making non-o multi entry for over a year would create the same loophole as DTV has, no checks on continued visa requirements because IO at the border is not an ideal option for that.