I've also heard this practice blamed for enabling a decade of "bad cgi"—visuals are reworked and reworked until time runs out, and in a rush they ship visuals that are worse than in movies 20 years ago. Explicitly: it's not the artist, it's a production pipeline failure. And indeed, it's easy finding marvel movies whose CGI looks closer to that of a video game than Lucas's prequels. Heck, even the sequel movies fall into this category.