In theory it does make sense to have someone who can veto everything on behalf of the state if the government goes weapons grade guano.

That doesn’t mean inheriting monarchy though. In Germany, we have a president as Head of State who has to legally validate all federal law by signing and is officially tasked with denying this signature to unconstitutional laws. So de jure the president has the power to prevent the federal government from getting on the crazy train. Unfortunately, there are ways around the president and in all cases of an unconstitutional law being deemed unconstitutional it was by constitutional courts.