A lot of concerns here and I think every comment deserves a different topic. What do you think?
Regarding DNS feel free to add your ideas here: How about PowerDNS? Replace dnsmasq with BIND9
“lack of being able to define extra partitions / storage devices” we have already this: Disk Management feature request
CA, let’s encrypt might do the job NethServer 6.7 02/16 updates & Let's Encrypt
Webtop and SOGo, you may be right. Add your thoughts here: Webtop vs sogo thinking
LDAP administration will be available with 7 version
Why not? Please open a new topic so we can involve more people and collect some ideas @a4rgl.
Do you mean this?