I don't see the need to be so totally black & white about this. There is no need to be 100% homebrew or 100% OTU, surely? If you want, you could be 95% OTU and 5% homebrew, for instance.
It is common for designers to create [interfaces!placeholders] that allow users to integrate their custom-built homebrew solutions with more established, branded content. Such as found in computer operating systems, mobile phones, social messaging platforms, stationary, photo printing shops, oterh game systems.
For instance, in the past few weeks, I've enjoyed playing UNO with friends. In UNO, there are wildcards that can impose penalties on other players. The creators have also provided "blank" wildcards, which let players invent their own penalties. This adds a creative twist to a relatively simple game.
It's mildly disappointing that some people here can't understand that point of view. However, it doesn't bother me; I can simply choose not to purchase one sector sourcebook and use the missing sub-sectors as placeholders to create my own homebrew content that fits within the broader Official Traveller Universe. This approach allows me to enjoy the best of both worlds.
So, let's have a CSOTHU = Crowd Shared Official Traveller Hybrid Universe.
Any takers?