Is the plan reviewer an engineer?

The granting of a permit is not usually considered an “approval” since responsibility for the design remains with the engineer and truss manufacturer. The plan reviewer’s opinion doesn’t necessarily mean the truss manufacturer and engineer made an error.

Seems like the reviewer asked a question and the structural engineer revised the plan in response rather than providing the calculations to show the submitted plan was sufficient. The original may or may not have been an error, but your engineer reconsidered his/her approach and provided a different solution. I often come up with a better solution when someone points at my plan and says "are you sure about this?". Doesn't mean the first one was wrong or woudn't work, or that other aspects of the plan are problematic.

If the structural engineer works for the truss company, he’s only looking at truss design, not truss support. Anything below the trusses is the responsibility of the general contractor, including additional studs or posts for truss point loads. All trusses should come with design sheets which show each truss, it’s design loads and reactions. Girder trusses commonly require more support or uplift hardware. Typically the plan reviewer is looking for this at plan review time and not in the field where it might be too late to fix. Some loads can be so large that sill plates can crush under them.
The plan reviewer doesn’t need to be an engineer, he/she just needs to know what questions to ask and where to find the answers. They are saving your butt.

This is how its supposed to happen. Looks like more than one person cares.

Many times it is best to just do what the inspector wants without question.

I disagree, Mark. Always ask questions if you don’t understand or agree. Inspectors are not always right and some have ego issues. Ask the questions, discuss it and double check the numbers. There is a solution in there somewhere.

And while you are arguing with someone with authority and unknown intellect and an ego issue, my project is getting built. Everyone must pick their battles.