My sympathies, especially as the text boxes are not that big in the PC/Linux version of D:OS EE that my friend and I are playing. It would be nice if the game would zoom to the character(s) speaking, but then the devs would probably need to animate them and their faces, lest many players would complain about the stiff character models that would be much more visible this way. And I suspect that they don't have that amount of additional development resources.
But as I understand you, it would be enough for you if the PS4 version had smaller text boxes like the PC versions have. And I'm always an advocate of options in games.