Thanks for continuing to lead a lot of thoughts and discussions into this topic @BlazeStudios 
it often gets one thinking about new ideas.
Didn’t RBA’s last set of mandates go in to effect in '22 ?
There’s clearly still a gap - eg. when the FCC Chair says, in March of this year:
“…phone providers rarely deliver dispatchable location information like a street address or the caller’s apartment or room number, despite the FCC’s rules saying that information should be provided when technically feasible.”
^^^ Going to include that quote in my related talk next week at FreePBX World Summit 2025! Hope you can make it!
Hmm… straight… a bit like soon…
Quite literally - although most likely not what you meant - the sort of direct-peering approach, while a cool idea, might fall under hypothetical NG911 territory 
and ultimately gets back closer to the decentralized, local approach to emergency response as originally envisioned 50+ years ago on the POTS (or on Batman 
).
But we aren’t (back) there yet!
You might consider that what actually happens a lot nowadays is not straight but more of a zig-zag:
The user dials 911 and it goes out the PBX to the SIP provider located half-way across the planet back to the PSAP destination across the street.
Therefore, it might be somewhat reasonable – depending on one’s particular environment – to add a few extra milliseconds in your dial plan by doing things that potentially increase resiliency and robustness, such as adding graceful fail-overs involving:
…or something else like the official FreePBX docs offer regarding notifications, or other ideas, especially if your organization includes dedicated connections to security teams that don’t need you to repeat your location three or four times but instead can deliver immediate assistance in seconds across multiple dimensions eg. both physical and phone-based, custom-tailored to your risk levels.
However, IANAL and it depends on your assessments of the trade-offs, especially in light of carrier failures, overburdened PSAPs putting callers on hold, liability, safe work environment requirements, etc. Point being that there’s a lot more factors to consider in parallel with the “straight shot through” argument because there’s always something potentially in the way. Robust solutions should plan around these roadblocks – not merely seek to meet the minimal compliance requirements.