I'm guessing construction companies also have a desire to maintain a fairly stable set of employees. Doing a project 3x faster isn't exactly a win when there is

I'm guessing construction companies also have a desire to maintain a fairly stable set of employees. Doing a project 3x faster isn't exactly a win when there isn't 3x the amount of work to be done to sustain the operation over the long term. People don't particularly enjoy boom / bust cycles, so finding competent employees would probably be difficult if everything was "go as fast as possible, then no work until the next contract hits". Construction is already seasonal. Making the work even more intermittent probably wouldn't work too well.