Allan Heinberg says condensing The Sandman comics into two seasons was always his plan, even though you might have heard Neil Gaiman's adaptations led that decision.
He made this clear after recent sexual assault accusations against Mr. Gaiman surfaced online.
So, the producers intended from Day One to deliver a condensed story over just two seasons, not because of those new allegations specifically.
That makes sense given how many details and arcs need covering across all twelve issues currentl

Wow, that's genuinely uplifting, knowing the Sandman adaptation was always planned as a concise two-season journey, totally independent of those unfortunate circumstances, isn't it?