The game has proper navigation between planets, you gravjump because space even between planets are huge and nobody wants to travel multiple hours, days, weeks or months (depending how close to the limit of C your story allows) in empty interplanetary space from planet A to planet B in the same system.
And the loading screens well that is the price to have a engine that allows for large numbers of manipulatable and change objects. All other engines have less loading screens yes but their worlds and places are full of statics that look good but can’t be taken or manipulated in any way. And I am very happy to pay that price.