Display in library or more room for movies?

[T4ffer]

I'm running close to full shelves in my home office again and thinking of making a proper movies+books library in a spare room.

If you had such a possibility to take a roughly square room and can put 1 full wall and half of two other walls full of (custom built) movie shelves, would you

A) Make space for a secondary TV screen in the middle of the shelves as well to be able to check or watch discs right there?

The main reasons I'm considering this is:

* to quickly check something on a disc without going to the living room upstairs where the projector is and main movie watching happens.
* I could finally enjoy HDR TV technology - currently I don't have another spot for a TV so I only have a projector in the living room and sometimes I miss those deep blacks.
* if I'm going to have comfortable seating in the library e.g. for reading booklets, there might as well be a screen.

B) No! Use the maximum space for shelves! You will run out again at one point!

A good argument for this is that there is no good compromise for the size of the TV?

* the bigger the better (for watching movies)
* the bigger it is the more shelf space it steals
* in the past what I've seen is that usually when people make a TV shaped hole in the furniture, it becomes too small at one point or another
* if I make it too small it might become a pointless purchase when it's so small that I won't really enjoy the movies there compared to a 150" image projected on the wall in the living room, and then it's just get the cheapest screen there for doing some quick checks

I'm not sure which option I'm leaning towards. Maybe I should do some calculations and see how much shelving my library actually needs at the moment or in let's say 5 years.