if I remember correctly a few players wrote that they reported a problem with nemedian foundations in open beta.
Plus it was a mesh change so I would expect a capable programmer to at least try to test if it will be a problem.
And anyway it went live , and cost them a lot of players and damaged the company name.

After this fiasco they simply HAD to do a rollback because they correctly reasoned that if they ignored it again and just gave some ridiculous compensation there would probably be a massive player exodus and the PVE servers would be dead ( who would trust a company like that and give them money?).