> why house can be inherited indefinitely and creative work is not

Because copying houses is inherently expensive, while copying creative works is inherently free. To make creative works act like houses you have to add artificial cost to copying, which is a tax the public has to pay for the entire duration of copyright.

If the public has to pay a tax they should get something out of it, and that something is the incentive for authors to create new works. But does copyright have to be for life + 70 in order to incentivize new works? Clearly not! It could be much shorter while still providing plenty of incentive.

Public doesn't pay a creative tax. You're free to buy or not buy any creative work. This is different with other assets though, you have to pay someone indefinitely to rent a place to live, even though building (or land) was built hundreds years ago and just gets inherited by new generation of landlords every 75 years.