10 Times Star Trek Didn't Think It Through

10. Achieving Warp 10

Beginning with The Next Generation, Warp 10 was established as the unachievable limit. We see the Enterprise reach speeds of 9 and above but for short periods. Transwarp was introduced in Star Trek III: The Search For Spock (in Starfleet ships, namely the Excelsior).

Descent introduced transwarp corridors. These would return in Star Trek: Voyager as the primary mode of travel for the Borg. Transwarp still far slower than Warp 10. 

In Threshold, the Shuttle Cochrane achieves Warp 10 twice. The episode claims that it inhabits every point in the universe at once. If we allow for a literal dramatic liberty, it's still very fast. Within the episode itself, there are plot shortcuts - if the evolved Paris could take Janeway anywhere, why did he just stop a couple of days away from home? 

Having managed to cure Paris and Janeway of their mutations, why were there no efforts to adapt Voyager with this new technology? Or when they reached home, why was their research not immediately spread through Starfleet? 

While they may have struggled to master the technology in the 24th Century, might not they have achieved this by the 32nd? This was a case of - fun episode, but never intended to play a larger role in Star Trek's history. Therefore, just like those salamander babies, it was brushed under the carpet and never spoken of again.