> For example, if the customer runs a legal firm, they should buy a CRM with functionality targeted towards legal firms

Even those won't be specialized enough, a legal firm that handles corporate megers and acquisitions has very different processes from one that does class action litigation or criminal defense. Successful CRMs are not opinionated, but are customizable - requiring an army of consultants to deploy and an internal role to support. Small companies may be coerced to using opinionated processes (quickbooks + whatever process the part-time bookkeeper wants), but every medium-sized enterprise or larger is a snowflake