Yes, if laws were optional then they would cease to be laws. Laws subordinate individual freedom and every state has laws.
Also the state itself determines what the constitution is and even how it's interpreted or overriden. So saying state is accountable to constitution (which is determined by state ) is circular reasoning.
There's a distinction here, or we wouldn't bother to have the word. People find it useful. You're in the minority if you don't, which is fine, but you're wrong about common use of the word, as recorded in a typical dictionary.
> Also the state itself determines what the constitution is and even how it's interpreted or overriden. So saying state is accountable to constitution (which is determined by state ) is circular reasoning.
Well, sort of. Human systems are messy and insisting that any term applied to them be absolutely true or else invalid won't get you far. That some governments would have more success and ease modifying the terms of their own constitution wildly counter to the will or interests of those they rule than others can easily be seen as true, I think, and is related to the set of norms and ideals held by those who believe they ought justly and actually to have a say in how the government runs, and to who sees themselves as being legitimately entitled to same, for that matter (i.e. do most expect that, or only some minority), and furthermore both of those are influenced by the constitution, laws, and actual historical practices of the state they're operating under.
Technically possible matters less than what is practical and likely when it comes to classifying human systems, as they're hard to pick apart and take one element at a time what with all the feedback and mutual influence involved.
The constitution is not determined by the state, it is ratified by a democratic vote. Sometimes this vote is conducted by representatives, and sometimes by popular vote.
I feel like you are missing a vital part of your understanding on how liberal democracies were founded and how the balance of power is distributed between the people and institutions that govern them.