My last job was COTS where we still sent out physical DVDs to customers (because some were on air-gapped computers) so we weren't just maintaining LTS branches

My last job was COTS where we still sent out physical DVDs to customers (because some were on air-gapped computers) so we weren't just maintaining LTS branches but had to actually make patch installers for all of them. A big benefit was that we could put the specific releng stuff in each specific branch (HEAD never had any releng and it got put on every release branch).