Yes, the HOFA installer is a little strange but no more strange than all these installer apps from plugin developers now like Waves, Plugin Alliance, Softube, iZotope, etc.
For me, the HOFA DDP Player via DDP Player Maker is just way more comprehensive than the Steinberg one, and the client/user experience is way better too. No additional download or install of the app. To people like us, installing an app is no big deal but some non-tech-savvy clients can struggle with this and the HOFA DDP Player/Maker makes it easy as possible.
Also, believe it or not, some clients still like to burn CDs of their master to listen and approve. I recently mastered an album for a client, and it had very specific song transitions and crossfades. After he approved the mastering he followed me on Instagram and I saw that he had burned a CD of the master and posted it. I’m glad he was able to faithfully burn a CD from the DDP Player I supplied to avoid things going wrong.