Well, that worked at wartime, when any pair of hands was welcome, and speed was essential.
At peacetime, people may not like to put up with the strain which such arrangement puts on them. It does improve efficiency, but had a cost, and works better at times of very high demand.
I take a risk to accept your job offer. I turn down other offers. Maybe I quit my current job to work with you.
if EVERYONE in the economy played by your rules, it might work. Might. As long as labor is in strong demand.