As for the Warp Drive thing, honestly, I'm wondering why this is such a specific issue?FTL (or other tech) is a cheat to provide more worlds to explore. If it isn't warp drive, then do we use wormholes or jump gates? The concepts all exist in other franchises, so eliminating this one seems rather odd, to me.
Because it's use has been excessive and greedy.
Why do we need access to 1,000,000,000 million stars if we can't find the ones in direct interest of value.
The need to avoid ftl isn't just about scientific realism, its about whether or not the tech helps to achieve the backdrop to storytelling of star trek.
And it generally cause a trek universe where literally every corner of the galaxy is filled with rubber forehead aliens.
Which this concept one can essentially goto 10 times the speed of light(relative to the people on the ship).
This to me seems like a fair pace if you want to actually focus on exoplanets, and nearby solar systems.
With a pacing that allows for 2 solar systems per season, each having multiple planets I think it's irrational to say there are not enough worlds.
The added benefit of having relativity limitations is that it's far easier for the viewer to really understand the degree to which each mission is truly experiencing the unknown.
Angain another doubling down is that there is a degree of traveling in both time and space as due to time dilation the crew will get to travel over a century forward into the future. Allowing for the people to make first contact to also be whiteness to their own celebrity by the millions of federation colonist that follow in their foot steps.
Again another advantage is the idea of the federation existing with no instantaneous communication. When one is isolated from their own time, the importance of loyalty to a grand galactic government only comes with more value.
While it is an interesting concept, I don't agree with the premise that FLT is overused, so I find the need to reduce it's effectiveness to be unusual.
Also, while I appreciate the concept of time dilation due to FTL I can see it forcing a disconnect between Starfleet officers and Federation colonies, since they won't really be able to connect with individuals there, since who they meet there may be dead before they see them again. In other words, every trip is a one way trip.
In other words, it is the experience of a soldier going on a combat mission made 100 times worse. The commitment the Federation's exploration mission is a lifetime one, it seems to me.
Sorry, for me, there are a lot of unintended consequences in this FTL concept.