Good for you. 9999 out of 10,000 people don't know what a "gmail web UI" is, or even that there's something called email that is separate from the gmail web interface.
Bold of you to think they know what is this.
I have seen enough people who wholeheartedly though the things in their phone stays in it and you lose access to them if you move to another phone.
The above poster is not talking to end users about the web interface. The poster is talking to you. About the fact that end users don't separate the interface from the thing.
You are making the same argument with the same language to someone that made the same point.