You have the point in some cases… But let’s see for my case: boot time, resources, used RAM … are so far uninportant to me - i never reboot my machine (unless really necesarry), i have 20GB of RAM on my DS920+ and no USB sticks so far. I made my TLS/SSL certificates through Synology DSM’s reverse proxy, which is as simple as it can get. Machine is fast enough, since i only use my Syno for file backups. I already have btfrs file system. So, only down side is (and i already thought of that!) samba only file access. So if HA crashes i have no file access for possible data copying/saving. For this purpose i copy HA snapshots to my local HDD occasionally.
Docker version is still an ancient 18.09.0-519 in Syno DSM, so until this will be solved (if ever, either by Synology or by some third party docker updater) i’ll stick with VM. I like my HA to be supervised.
EDIT: i just found some info… supposely Docker version will be v20.xx in DSM 7.0. Can anyone confirm that?