It will affect cross-platform extensions that need to migrate to Manifest V3 this year. Some projects will be forced to stay on Manifest V2 just for Firefox, substantially increasing development cost because of the need to maintain both MV2 and MV3 versions across platforms, or abandon a substantial part of Firefox users and only support the most recent browser version, assuming that a fix is even implemented in the browser.
Regarding your edit, I have not demanded anything, but asked if it would be possible to delay the release, for all the discussed reasons. For which I have received a non-answer, "it has already been merged" is not a valid reason for not correcting a mistake, and asking people to invest even more of their time in this and repeat what has already been discussed in a new bug report was just the last drop that made the lack of respect for other people's time obvious.