They seemed to be sure hiwever that they are right. But I also say. Let time decide if optimism or pessimism was correct.
I think that surety exists with the posters on both sides of the issue here. That doesn't mean, though, that the posters(on whichever side is wrong) will refuse to admit the error once the rules are released and some time has passed to see if there are issues or not with compatibility.
I know that if I can be shown hard proof that I'm wrong, I will generally back down. I say generally, because sometimes what is being told to us by the official source is clearly wrong. As a recent example, when WotC announced the new OGL and that they were getting rid of the old OGL, they had language in the new OGL that would allow WotC to essentially steal the work of third party providers without compensation and forbid them from using it any further.
Everyone here, their mothers, and their mothers' 29 cats(Thanks to
@OldSchoolGamerGirl for putting the cat lady image into my brain) immediately saw what the language would allow WotC to do. WotC's initial statement, though, was that nobody saw that possibility. That would have to mean that all the officers who read and approved the language, and who deal with legal documents in their business, their assistants, and all the lawyers involved with drafting and reviewing the language, all missed what we clearly and immediately saw. And hell, the job of the lawyers is to think about and recognize the potential pitfalls of what they are drafting. It's what they are trained to do. WotC's statement was clearly a lie, so if someone had quoted that statement to me as proof that they didn't know, I wouldn't have accepted it.
In this thread
@mamba showed me a quote from an article regarding the naming convention for the 2024 rules. I acknowledged that I was wrong about the naming being unknown. There have been other instances where I have acknowledged that I am wrong and changed my tune as well.
Probably something in between. And I agree with
@mamba that working to have as much compatibility as possible is a better goal than either throwing the baby out with the bathwater (6e) or closing the eyes for existing shortcomings and expecting people who are coming to the hobby to buy phb 2014, xanathar, tasha and johnny and pauls and elsas x of everything and some sourcebooks to have halfway up to date rules.
Sure, but "as much compatibility as possible" doesn't necessarily mean backwards compatibility will be achieved. This is a truly binary thing. Either you achieve the backwards compatibility or you don't. I don't think it will take long after the release of the 2024 rules for the masses of people out there to find broken combinations of 2014 and 2024 rules, requiring a good amount of work on the the part of the DM to make it work, or else causing the DM to throw up his hands and just declare for one year or the other, ruling out books from the other release.
Edit: corrected typo