Because despite being in development for over 4 years, the actual story is only 4 days deep so it's frankly ridiculous to imagine that all the scenes depicted in dreams could've happened irl (you know what I mean)
The use of dreams and fantasies allows Ranli to cram more sex into his game than he otherwise would while writing a coherent story and I applaud him for it (although he did concede, on discord, that he overused the ship as a setting for Cole's dreams, will use other settings for Cis' and Sam's updates and may revisit Cole's to create new settings for some of the existing dreams)