Before 1.0, the game was very open. You could play tall, you could play wide. Cap fleet was much looser, research was faster, exploration was significantly faster. You could set games to Hyperlane, Jump, or Wormhole styles (or mix all of them) - to give variation/limit to how movement would happen.
After 2.0, they severely nerfed fleet cap, research suffers more from population, exploration can only be done by science ships. Travel is only by hyperlanes until the very end of the game.
I have played one total game of it since 2.0 came out and I did not even finish it, compared to the 270 hours I put into it previously.
Look at the number of negative reviews before 2.0... and look at the number after. Mind boggling.
And of course, Paradox has refused to walk back the changes. We will see how well their next DLC for it sells.
It is a shame. I REALLY enjoyed Stellaris. It was the best space 4x in the last decade.