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Interesting that your plumber would say that - or maybe there is some confusion as to what he really meant.
The end of the sewer line MUST have a vent to the air to prevent accumulation of gases in the sewer line. This would be at the end or highest point. This is called a 'discharging stack vent'.
A vented cap doesn't do that - it allows air to be drawn in to prevent suction evacuating the trap but doesn't allow air out to vent. This is a 'relief vent'.
So two quite different purposes.
So adding a toilet may only require a relief vent but the installation must have a stack or terminal vent somewhere.
I see where you are coming from , I'm guessing in this situation because this was an additional toilet the existing vent system for the other toilets was able to be utilized and all that was needed for the new toilet was an air inlet vent to allow the water to drain properly. Learning curve for sure!
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