Being duped here with a more specific bug, i.e 
19.10
optimus hardware 
No login to ubuntu session possible with gdm, lightdm is ok

Maybe a few  comments.

This bug orig. suggests that  one could actually login on optimus hardware with 
nvidia-drm.modeset=1 thru gdm. That was once the case, it no longer is in 
19.10. 
The only session available is a wayland one because it falls back to Intel.

As far as why users set nvidia-drm.modeset=1? 
I'd suggest the majority do so on optimus  machines to be able to use nvidia 
without tearing. For the most part none have any interest in wayland  even 
though wayland would solve tearing. 
Why?, because no (or virtually none)  optimus machine has ever been able to use 
wayland & nvidia drivers. Not in the last couple of years, not now.

While I don't have a desktop machine I do have a laptop with nvidia GPU
only. In that case (19.04) with nvidia-drm.modeset=1 it presents and
logs into a wayland session but llvmpipe only.  It does work ok in a
ubuntu session. Maybe I'll give it a try with 19.10 though on this
machine there is no tearing so xorg is fine, currently any positives, if
any, of wayland are outweighed by it's negatives.

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https://bugs.launchpad.net/bugs/1716857

Title:
  nvidia-drm.modeset=1 results in no monitors detected by Xorg

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