Most of Japanese hates the arbitary currender year resetting at each new emperor enthronrment. The conversion is ass and no one knows when it changes (bound to emperor's health) . Worst is its official year that govmt body accepts.
You are likely to only refer more than current era. If you're writing govmet grant application, renewing licence or certificate, chances are you mention events hapenned in previous era. You look up table for when the previous era started and ended, which era said year falls into, then convert for each year, each era. Extra minutes wasted every time instead of simply writing in Gregorian year.