Probably because the number of channels on a traditional LA is so large that laying it out like the Tek screen would be unweildy beyond a very small number of signals. Even on the Tek display it seems to only be showing a subset..
I haven't tried this but you might explore on your favourite tool :
Typically, serial busses can be analysed on-display and show a separate trace (more like an eye diagram than an oscilloscope trace) that places the byte value numerically on the trace.
If you can group several signals together and have them displayed as a parallel bus in the same way, you will probably get instantaneous bus values shown, perhaps only where the cursor is placed to avoid overfilling the display. You might be able to set up a single bit bus to do what you want.
I'm not sure if this feature actually exists, it's kind of a mishmash of expectations and partial features. But it ought to

. And for Pulseview at least, anybody could add it, because it's open software.