There's no "consumer class". Every person is a consumer, including those who are entrepreneurial. Being entrepreneurial simply means you are in charge of what gets produced. The market then decides whether what you are producing is actually needed. If it isn't, you go out of business. Resources get re-allocated.

The efficiency of this process is the whole argument on why capitalism is superior to other systems.

Subsidies and other special favors distort this process, to the point of overproducing things that are not needed and underproducing things that are. The danger I see is that UBI is exactly such a subsidy.