Why wouldn't you continue to have government officials and a standing human army with regular recruitment? Just because there is UBI and most people don't have

Why wouldn't you continue to have government officials and a standing human army with regular recruitment? Just because there is UBI and most people don't have to enslave themselves to eat doesn't mean people won't want to do something with their lives. Soldiers and officials get UBI plus salary and they are chosen the same way they are now. It seems that you just want to setup a straw man argument that you can then knock down. UBI doesn't replace all human labor. It just incentivizes automation and puts people first. You'll still be able to find a job as a mechanic or robot engineer or programmer if you want. Then you can take a paycheck and UBI. But it will be of your own accord instead of forcing you into compliance with wage slavery like we do now.