At ~250c it still takes a very long time to get to stars that are a significant distance from their parent (10s of thousands of LS). It's far from entertaining to alt-tab from the game and wait for 5, 10 minutes while you (relatively) slowly approach a location.
I'd suggest increasing the maximum speed in supercruise to a larger number, or allowing short FSD jumps (though lore says no on that iirc). As a game, Elite does need to balance between simulation and being a game. Hurry up and wait isn't terribly good in this situation.
It is, it hasn't been mentioned yet but max speed in SC is 2001c, and no not many people actually reach that speed. The thing is, and it has been mentioned, you don't have to do that, you don't have to go there, you don't have to explore that distant star or distant planet. That distant star or planet is there for a reason. They could indeed increase the speed of SC if they so had a mind, but it wouldn't silence the players who want to be able to jump in hyperspace to that same star you want to get to a little bit quicker, or indeed jump directly to that station you don't mind flying to because it only takes a few minutes.
The flying, the SC, the travel is an integral part of the game, it wouldn't be the same game without it. Without it you wouldn't need to decide if you wanted to explore that distant star and planets, you wouldn't need to decide if you wanted to take that delivery mission to Hutton Orbital, it would just be the same as every other SC trip you do to every other station, and to be honest that would just be plain boring for a lot of people. It would just become a spread sheet of delivery missions. There are plenty of missions and trips that don't require travelling a long way, and there are missions and trips that do, so people have a choice.
There are plenty of features and aspects of other games I find boring, I don't do those bits, I do the bits I enjoy, but I wouldn't see the point of demanding it be changed because it would be destroying that aspect of the game for the people who did enjoy it, and I don't see why I should do that.