Hi Renjith,
Along with the introduction of BW on HANA (starting with release 7.3) SAP revised its Enterprise Data Warehousing best practice and reference model LSA: it became LSA++. It is streamlined with and optimized for HANA, offers a multitude of new technical features and a shift towards more virtualization and less persistence (i.e. an evolution towards a logical data warehouse). It is therefore also applicable for subsequent releases of BW on HANA, e.g. 7.4 and 7.5 (and any future releases).
Best regards,
Sander