This is true, except it has a huge underlying requirement: that all deployments are forwards and backwards compatible. i.e. a running service must be able to talk to the older version of itself, and vice versa (and of course the chain of dependencies). This is a much bigger knowledge investment, easier said than done.

It pays off in the end, but not worth making it a "criteria for success" when breaking out from branch-based to trunk-based continuous delivery, otherwise the trunking will most likely end up never happening.

shameless plug: at goeuro.com we shifted from branch-based to trunk-based CD in a short time (<3 months) with a diverse set of services and workloads, by applying a holistic socio-cultural, technical and process approach. Could be of interest if anyone is trying to make a switch: https://youtu.be/kLTqcM_FTCw