Your thoughts on SME needs;
are close to mine, the CRM element being ultimately decided on by the business' activity and requirements.
See this for more detailed description of CRM
https://en.wikipedia.org/wiki/Customer_relationship_management before deciding on one that suits you.
We did try a few (including Odoo, SuiteCRM, Zoho, vTiger, IMS Integria) before implementing Dolibarr, because it was the most suitable for the business.
CRM as a feature in NS? If the community decides or votes on a specific one, then yes, but there is no one-size-fits-all CRM.
Our office Nethserver 6.9 (DHCP, DNS, mail, g/w, print server, FTP, VPN) also hosting Dolibarr 5.0.4
Clients are Linux Mint, a few Windoze desktops all using LibreOffice, and their favourite browser to access the CRM.