Yes, that is a real risk—but it is not automatic. When national and state elections happen at the same time, campaigns can become dominated by the national campaign narrative: the prime ministerial contest, national security, or the central government’s record. State-level policy debates, such as schools, local transport, or water supply, may get less attention.
The effect depends on how parties campaign and what voters hear. Regional parties can keep state issues in the conversation, and local media coverage can give voters room to compare candidates on state performance. Voters may also distinguish between their choices for national and state office, even when they cast ballots on the same day.
So the concern is less that state issues would disappear and more that they could receive less time and attention. Whether that happens would depend on campaign coverage, party strategy, and whether voters still get a clear chance to judge state governments on their own record.