Interestingly, for a change this time, SAP has not increased the simplification items list and instead done more of harmonization in S/4HANA 1909:
However with fiori application count in S/4HANA 1909, crossing 10000+ fiori apps, there are many new fiori apps, changed apps and some apps getting deprecated in future. This blog will touch upon these aspects in Finance area and full list of such changes in can be seen in SAP Fiori library.
Important New Apps in S/4HANA 1909:
Some changed apps in S/4HANA 1909:
And then some apps which SAP planning to replace in future:
I hope this gives to some motivation to go inside SAP Fiori Library to see what is more for your area/LoB in S/4HANA 1909. Thanks.