I would say the works of Rupa and Ragganatha are something like the puranas and itihasa.
In Kali yuga, it’s very difficult to source the meaning of the Vedas. Thus, the puranas and itihasa are more easily understood . These are the  trancendental historical accounts of spiritual activities carried out by Krishna or His incarnations and expansions . Did Krishna not come to display lilas for the purpose of attracting His devotees and didn’t Sri Caitanya Mahāprabhu , particularly in Kali yuga where the Vedas is little understood request and empower Rupa Ragganatha and the other Goswami’s to write of these both in philosophical terms as well as to record those trancendental events . Such trancendence is deeply within the  hearts of the Goswami’s ,  their deep meditations  , thus their writings bring. the very pinnacle of the truths of Vedas and the ultimate goal of how to attain an attraction for and perfect our love of God .

Both Krishna in Vrndavana in Mathura and Dwarka are described and many many trancendental lessons can be learned from them via Krishna’s pure devotees who have recorded them so both Sastra sanga and Sadhu sanga are important to Gaudia Vaisnava devotees

Sri Caitanya Mahāprabhu lila is also described by them ,  Gaura lila Krishna Lila no difference one in union one in separation . Mahāprabhu clearly shows the strict life of a renounciant , and by that process, only one can access the truths of the Vedas . One who engages in material sense gratification outside of Vedic principles can not access the secret of all secrets.
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