Big Boo wrote:
100 years after Janeway brought back transwarp they would have perfected it, exploring a great portion of the milkyway
It isn't just about having a super fast propulsion system, as pointed out our galaxy contains several hundreds of billions of stars.
There are 1,875,000 stars in a 1,000 light year sphere centered upon Earth.
On the average six and a half percent of them will be of the same spectral type as our sun.
Picard stated that the Federation was 6,000 light years in length. There reasonable has to be lifetimes worth of stars within the Federation that no one has been to, that could be explored.