BVS was when it all fell apart and that's on Snyder. They never recovered from that disaster.
Why people keep caping for that man is beyond me. He's not a great film maker.
BvS was 900M and Suicide Squad was 800M and without China. WB back then got greedy and INTERFERED in the production process the whole time. The BvS director's cut proven that which EVERYBODY felt was a vast improvement over the theatrical.
The problem is what it's been to this day. The front office executives not allowing the artists to have total creative control. The only time Snyder had full creative control was with HIS VERSION which been the ORIGINAL version of the Justice League and AT&T only allowed that because they were desperate to get HBO Max subscribers.
WB should've left Snyder alone and freely be the Freige for DC. Snyder was the one who tried to bring in LORD & MILLER to write and direct THR FLASH and WB rejected it. Now ironically Lord & Miller dropped Across the Spider-verse week prior with a similar premise and it's vastly superior.