Where I work, Salesforce is the ERP and also powers a lot of our front end.
Its core strength (if you don't fall for all their salesy mumbo jumbo magical mystery tour weasel words) is that "native applications" require zero integrations/configurations. They "just work".
Salesforce is the CRM. It is the source of truth for our customers, orders, vendors. It is also the service (help desk agents use their VOIP to help customers and transcripts are automatically logged). It does the marketing. It also does our financials. It also integrates with our survey SaaS.
It also powers a lot of front end because our front end stack sucks. We use SOSL to power our front end search. It also creates micro-sites that our front end points to.
They also have an ecosystem of third-party apps that "just works".
With all that said. It is very expensive. Mulesoft is horrible. I wish they tone-down the salesy bullshit; they don't need the Microsoft-Azure level of bullshit -- Salesforce actually works.