I mean…sometimes the speech speechbubbles tend to get displaced when you zoom at a certain angle and need to be corrected but when your story has a lot of dialog from an array of different characters in a single scene, spotting all of them takes way too much time. Luckily for us there’s always the display name so we know who’s speaking even if it isn’t pointing to the correct character.
I usually spot them for off screen characters or a narration bubble to emphasize a specific place on screen.
The bubble size however, is a good idea because they tend to completely block spotted far away characters in a zoomed out scenes.