Why make a presentation template in Powerpoint format?
It is reality that Microsoft Powerpoint is still most popular presentation software that people use today despite the fact that scores of people dislike that.
Many of very good alternatives trying to offer a competition and even replace Powerpoint in some time. Main Microsoft competitor Google have fully loaded software platform for viewing, sharing and making presentations and it is Google slides.
While other online presentation apps such as Google slides and Prezi are available, Powerpoint will still be important as a default business presentation application.