List of client fixes and improvements between 11.5 and 11.73

Hello esteemed colleagues,

I have some departments in my agency that need assistance with keeping their clients updated to the latest version and am hoping that you an provide me with some evidence or docs, to help them see the good in keeping clients up to the latest release for their version of SEP in production(11.0.7101). These people have some clients at 11.0.5, 11.0.6 and are reluctant to update to 11.0.73(latest11.x client). We will be standing up a new SEP12.1.2 environment and manging these clients soon but any data or release notes for these earlier versions can help me convince them to get to latest v11 and v12 clients is appreciated.

Thanks in advance