Hello @stretchand
Ad 1. Stock Room Management is not being phased retired close now. It is supported. However I don't deliberation it's going to past forever. Sooner oregon aboriginal SAP is going to driblet LE-WM / Stock Room Management successful S/4HANA successful favour of EWM.
Ad 2. Having said that, Stock Room Management is inactive a valid option. There are enactment notes detailing LE-WM functionality covered by Stock Room Management license, e.g. prime waves are excluded.
Ad 3. Roughly basal EWM covers the aforesaid functionalities arsenic Stock Room Management e.g. prime waves are excluded some from Stock Room Management and basal EWM. Again enactment notes provides details connected what's not allowed successful basal EWM.
In short, if you deliberation astir a caller implementation, I'd suggest basal EWM alternatively of Stock Room Management.
Best regards
Dominik Tylczynski