Particularly in tech and tech adjacent, there's a belief that doing what everyone else is doing is safe. It's the "nobody ever got fired for buying IBM" approach but for corporate decision making.
If other companies return to office, you return to office. They're successful, so they must have good reasons - no need to investigate or come up with your own reasons. If other companies eliminate QA, you eliminate QA.
Most tech companies are just following what the big dogs are doing, but worse and stupider. When it backfires, nobody cares.