Why certain temples, including Divya Desam like Thirunangur, do not have Dwaja stambham? What is the difference between temples with Dwaja Stambham and temples without Dwaja Stambham?

There are reasons like lack of space or practice. Each temple has some reasons. But the temple does not have any defects due to the lack of Dwaja Stambham. The temple which does not have Dwaja Stambham conducts Brahmotsavam regularly and offers bali-samarpanam every day.