Why has Azhvars sung lesser number of pasurams on Kanchi Varadhan than on Arangan and Thirumalaiappan? Though Hastigiri is equally divine kshetram like other two kshetrams, why did the Azhvars’ pasurams not resonate the same status? Is there any reason behind this? Kindly explain.

Generally, all the sanctums and kshetrams where Emperuman graces are divine.
Notes:
Swami Desikan had said ’muhyantaya bhanguradhiyo muni sarvabhoumaH’ in Varadharaja Panchashat. The inference here is that Azhvars having been mesmerized and lost themselves upon witnessing Lord Vardhan’s enchanting form, have sung lesser number of pasurams on Him.
This is the reason even though lesser number of pasurams were sung on this kshetram does not lack in glories that are found in Arangam and Thirumalai.