Additionally:

• while the food will taste the same, in most cases the mouth feel is so horrendously bad it will be inedible
• rehydration of most foods is very hard to impossible, limiting it's uses even more
• if you put more than one kind of food in a batch, the chance of error in the process increase dramatically, because all food needs different amounts of time to dry

I'm pretty sure the only actual use cases are berries and fruits. But those can all just be dehydrated normally or made into jam, so there is little to no purpose for a freeze dryer, except playing around with foods, which is not worth the price