If you don’t choose to extend in country, you have to leave twice a year (every 180 days) . Not once a year … And in some cases, it can even be 3 times a calendar year (if you do a border run on Jan 2, you have to leave again on day 182 early July then leave again on day 362 late December).
Tell that to the ones who got questionned on re-entry. Plenty here and elsewhere … and it’s just the tip of the iceberg : not everybody reports here or on other forums …