Adding drivers license won't take up space in the resource pack at all.
The sum of all the little things eventually leads to a large file size for the resource pack, and as a member of the 3D modelling team yourself, you should understand this better than anyone that this is the issue. That being said, this was one of my weaker arguments and one singular model isn't going to destroy the server, so let me continue.
Complaining about inventory space is just stupid since you should always have both of these government required things on you.
As somebody who prefers keeping a lot of open inventory space, I dislike having items I deem unnecessary,
especially if they are mandatory. Many players were upset over the first mandatory identification card, and I doubt another would be well-received. It would only be one extra item, though "one item" adds up over time, and eventually fills the inventory. Its better to minimize the amount of items a player
has to carry, if at all possible.
Adding a extra lore section for drivers license doesn't make sense on an IDENTIFICATION CARD.
You didn't support this argument with anything, but I disagree. Having one singular identification item that could be used as a special card for any license or identification would be a massive convenience, as then players wouldn't need to keep and hold an array of different IDs and licenses. Doing so through additional item lore would be convenient as then anybody could tell simply at a glance what licenses or identification they have. I'm unsure how it would tie into the current ID commands, though that's up to the developers to figure out.
Drivers license would add more realism since we already need I.D to buy alcohol and all that why not get a drivers license too?
I'm not against the concept of a driver's license, but the idea of it being its own unique item. I wouldn't have offered input into an alternate solution if I thought it was a bad idea.