This Scroll article quotes an IDFC Institute 2015 article to discuss the effect of holding simultaneous elections at the Legislative Assembly and the Parliamentary level on election outcomes. The article states:...

The proposal for simultaneous elections to Parliament and state assemblies seems unworkable for now.

‘One nation, one election’ might sound appealing, but it will have a number of anti-democratic consequences.

The urge to end the annual poll parade is political in terms of synchronization and economic in terms of the cost of holding elections and opportunity costs.

The case for holding simultaneous elections in the diverse, federal Indian polity is weak.

Praveen Chakravarty, Senior Fellow at IDFC Institute, cautions against the growing calls for simultaneous Centre and State elections in India.

This “one nation, one policy” notion is deeply flawed and ill-suited for the India of today when the differences among its states are the starkest in the world

The inference that people deliberately vote differently in the national and assembly elections is a bit trite.