Earlier quoted context omitted.
What do you mean tricks exhaust? It's a loophole, so it will work until the laws are changed to close the loophole. It makes no different to the landlord or tenant if the base rent is dropped, or the effective rent is dropped (assuming everyone can do basic math)
The landlord is selling: - A month (or year) of time in the apartment for cost $x. - An option on purchasing more time for cost $y/time unit. What these "tricks" do is make $x less than $y. That makes sense in the short term when you expect to be able demand higher rent/unit time in the future. When that expectation is no longer likely, it makes sense to lower $y to $x because other landlords will, and they will have…
I look at it like: the fair value for rent is x. The current rent is y > x. If the landlord nominally lowers the rent, they cannot raise it to as high a value next year, and they do not want to do this. Therefore they are incentivised to (effectively) give the tenant money along with the rent to decrease y without changing the nominal rent and giving up on the right to increase it.