and was replaced by ECC on Netweaver, that got then replaced by business suite that then became SAP S/4 Hana, which is now SAP HANA on cloud.
The problem is not so much standardized workflows... its more this - the original design of SAP R/ and ECC was tightly coupled, with dependencies everywhere, which initially gave a massive competitive advantage. Customers added a lot of custom code to this and created even more dependencies. Since 2018 SAP have been asking their customers to keep the core clean, this message is just and I mean only just beginning to sink in... Customers have a long way to go.
Then S/4 Hana has a different database model, so upgrading involves a DB conversion, with a lot of effort required to achieve, and the benefits, are perhaps less than super clear to customers, although the main appeal to developers is that they can start to build less tightly coupled solutions (around CDS, RAP etc).