Where I work, we are planning to ditch our very expensive web portals and mobile apps to go all-in with Salesforce. We plan to build several Salesforce lightning communities to be used as our front-end portals. Salesforce will convert these communities to mobile apps as part of our contract. Along with the base Salesforce org, we have Marketo (marketing), Service Cloud (customer support), Financial Force (ERP), Tableau (BI), Tableau CRM/Einstein Analytics (analytics), B2B, and Mulesoft. The only products I question are Financial Force, B2B, and Mulesoft as they are very expensive for what you get.