It's not so complicated to judge whether rents are too high or house prices are too high or both. It might be somewhat subjective, but that's government's job - to make those calls.
But the market adjusts automatically so why do you even need a government to make a call?
That's like saying the government should be involved in making a call as to whether apples and oranges are too expensive relative to each other in the supermarket.
That's like saying the government should be involved in making a call as to whether apples and oranges are too expensive relative to each other in the supermarket.