There are a few concerns I have with this being implemented:
✩ As said by aestheticsushi, I believe the reason these were taken away in the first place was because people would get out of the world border, which is obviously a concern for both the staff team and the developers.
✩ The use of ender pearls could allow players to glitch into places they aren't meant to be in, such as in walls of houses, through doors, trapdoors, etc.
✩ There is also the chance that an excessive use of these would lag Creative exponentially, causing it to crash.
✩ After doing research, ender pearls have a 5% chance of spawning endermites, although the developers already changed the variable of being able to spawn entities in Creative so this would be more of a bug.