This seems to be a pattern started in cyberpunk NEO and art deco SNC. I suspect WotC are moving away from more traditional fantasy settings to make their Universes Beyond sets seem less anomalous.
I think that may be a little bit of an overly-cynical take. WOTC usually plays things pretty safe as a company, so the idea that they would make a bunch of risky sets in short succession just to push other people's IP that is in no way guaranteed to succeed seems a bit far-fetched.
What seems to be going on instead is something akin to the "worlds diversification" that happened after the end of Onslaught block. Before the Phyrexian Invasion, basically every Magic set was either on a Western high fantasy or techno-fantasy setting either on Dominaria or a related Plane. Mercadia, Rath, Ulgrotha, and so on were all pretty similar to Dominaria. However, following the end of Onslaught block wrapping up the content related to the aftermath of the Phyrexian invasion of Dominaria, we spent most of the next decade visiting new planes with wildly different styles from what had been seen previously. We mostly went to new worlds that didn't tie in too much to previous content. We visited a world of Metal, Feudal Japan, a City world, a Celtic world without Humans, and more! Obviously, there were a couple of exceptions (Time Spiral block, Karn creating Mirrodin, and the Umezawa family hailing from Kamigawa being the three primary examples), but as a whole, the idea of what a Magic set could be grew.
That changed for a few years, starting with Khans of Tarkir. Although we visited plenty of new worlds, they all tied in with the ongoing story in some capacity. Tarkir was the battleground between Bolas and Ugin, Kaladesh was Chandra's home plane, Ixalan was a prison that trapped the Azorius guild parun
Azor, New Capenna only exists because of the Phyrexians... everything tied into the Phyrexian arc or the Bolas arc in some way or another. While this synergy was important for the stories that were being told at the time, it also meant that the multiverse started to feel smaller. Everything was related to people we already knew and stories that had already been told. Additionally, the ongoing arcs defeated most of Magic's major ongoing villains. Bolas? Sent to Australia. The Phyrexians? Defeated and swapped places with Zhalfir. Even the Eldrazi were either burnt to a crisp or sent on a
vacation to the moon. The previous decade of story work has paid off, and now a new direction is needed.
As such, I think Wizards is repeating what they did following the original Phyrexian invasion and introducing us to new characters and new worlds to set up future stories. We're getting a couple of sets dealing with the aftermath of the Invasion (in this case, Wilds of Eldraine and Lost Caverns of Ixalan instead of Odyssey and Onslaught blocks), and then we're off to some strange new settings unlike what we've seen previously. We're going to meet new characters, be introduced to new Magic concepts, and tell new stories. And just like with the last Phyrexian invasion, we're going to go to settings that push the boundaries of what the multiverse can contain. The big difference is that we are going to be going at a faster pace because blocks don't exist anymore.
I might not be 100% correct about this, but I feel like the Multiverse has been fundamentally changed as a result of the Phyrexian invasion. I don't see any benefit in going back to the status quo after something like that. Now really is the time to push boundaries, because this is essentially the first opportunity we've had for a soft reset of the Multiverse since 2006.