All I can say in general is that the BJT must be saturated to be on. How it performs depends on the components you select and put together. Perhaps a BJT is not the best component to use. Don't manufacturers sell solid state switch modules?Perhaps you find it easy, but I don't find it to be trivial. Especially trying to design a circuit to have a clean on/off controlled by the presence/absence of 2-3v. The difficulty I allude to is selecting an appropriate transistor to do the job based on the datasheet.