Maybe not. First, what time range are you looking over? In my demo environment for the last 5 minutes I see less than you do for ESX/ESXi hosts. For the last 24 hours, I see the same as you for SCSI/iSCSI and NFS. It really depends on your environment and what logs are being generated. You will notice that many of the dashboard widgets have the word fail/failed/failure/etc in them (look at SCSI/iSCSI and NFS), if you are not experiencing any issues then many of the widgets will display no results - this is a good thing! Now, if you have a lot of environmental issues then perhaps many widgets do have results - this likely points to one or more problems that need to be addressed.
In regards to ESXi logs, you options for log forwarding are enabled or disabled. There is not an allow this file, but not that file. The configure-esxi script configures the remote syslog target for you and also ensures the firewall is configured properly on the ESXi host. If you have used it then the vSphere content pack is working as designed. You could try adding more devices to Log Insight or triggering some problems to validate the content pack is working.