1. Someone owns one of these systems which is functioning perfectly well.
2. They stumble across a link allowing them to download the controller app, and so they install it on their normal tablet, expecting to be able to control the system from their tablet
3a. It doesn't work, so they contact technical support. Technical support wastes a bunch of time before figuring out why the app isn't working, only eventually to realize what's going on.
3b. They can't get the app to work, and so slag the system on social media.
Both have costs both to the people who end up downloading it, and to the company -- costs which could be avoided by having a simple error message.
Paired with their attitude towards repairing the broken tablets, it's clearly also a part of their "planned obsolescence" scam.