sight tubes are by far one of the ugliest things possible to put in your engine bay...if you want one ill add it but im going to charge extra not for the labor but for the eyesore.
opening the lid and peeking in is part of regular maintenance. Do you have a sight tube for your oil in your engine? Transmission fluid/gear oil? Blinker fluid?
Now if I can come up with a way to have a "sight" window on the tank not a piece of tubing hanging off the side then I'm all for it!
On the note of being pressurized, I have been giving this a TON of thoughts from an engineering standpoint and I do not see any reason at all why this is even necessary. There are no known issues with a "normally non pressurized" coolant overflow reservoir.
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