Does the inability to pre-program events using the Hijri calendar make it useless or unsuitable?

What is blameworthy is to exclusively use the Gregorian calendar while forsaking the Hijri calendar. As for using both the Hijri and Gregorian calendars together, it is permissible, and there is no dislike for it. The issue of the Hijri date changing can be resolved by mentioning the Gregorian date alongside it, or by mentioning the day, such as "Friday" or "Saturday."