This discussion so far ignores cost. That's a problem.
And cost has to do with intensity of effort. In the case of construction, if there is less construction going on, then there is ("all other things being equal") more personnel available: so less delays and less hourly cost. If there is less construction going on, there is also less pressure on materials suppliers, so less expensive lumber, concrete, etc. So that it's easier to make a profit. So that it might make sense to build lower value housing. While when construction is booming, there is extra less incentive to build lower value housing.
Of course, if land availability is artificially constrained, then there is never much reason to build lower value housing. The profit is elsewhere.
And cost has to do with intensity of effort. In the case of construction, if there is less construction going on, then there is ("all other things being equal") more personnel available: so less delays and less hourly cost. If there is less construction going on, there is also less pressure on materials suppliers, so less expensive lumber, concrete, etc. So that it's easier to make a profit. So that it might make sense to build lower value housing. While when construction is booming, there is extra less incentive to build lower value housing.
Of course, if land availability is artificially constrained, then there is never much reason to build lower value housing. The profit is elsewhere.