It hasn’t changed at all. This is the second topic you started which postulates a problem where none exists.
First it was Marvel CU needs to reboot, when no one in their audience is asking for any such thing and the financial results show no need to fix anything.
BTW, your claim that Marvel needs a reboot — supported by nothing — directly contradicts that shared fictional universes are no longer the hot item.
Now, shared fictional universes are out, you claim, but you offer no evidence, not even a proper critique for such a claim.
Also, the idea that shared universes are on the outs is supported by nothing happening with the movie studios.
Every statement DC Studios has made since creative head Gunn has taken charge indicates DC movies going forward will be MORE interconnected in a fictional universe, not less. This is viewed by industry watchers as necessary for DC to make money for WB Discovery.
Marvel’s properties are also more intertwined than ever, with even their streaming shows now directly connected with their Marvel Cinematic Universe.
Shared universes are a bigger thing than ever. It’s even happening outside of comic properties to other fantasy movies. As for why it’s happening — money. Marvel has shown it can be very profitable to have your characters in a fictional universe together.
Quite frankly, you’re just wrong.