This just in: Fenway Park was built in 1912. It has poles. Poles mean obstructed-view seats. Lots and lots of them. A few of those seats are planted directly behind massive girders.
It also has a roof over the main grandstand. A roof over the main grandstand means many people cannot do two important things, which one being more important depending on your point of view. These are 1. You can’t keep track of a ball in flight. 2. You may not be able to see the scoreboard. The former is an annoyance, well, just because. The latter is a shame because management has spent many millions of dollars on that scoreboard, not to mention the fact that the thing is actually pretty cool.