We played 3.0/3.5 side by side with rules taken from both for 2 or 3 years at least.
right and I played 18 months of a D&D game that used the willpower mechanic form Wod...and I played for a long time (not sure how long less then a year) with a jedi, aflash like super hero and our D&D characters...
that doesn't make the default of the game that WoD and 4e (the system we did it with) being compatable... it means we took ideas and made house rules.
You used some rules from 1 game in another game. nobody brough the 3.0 phb to your 3.5 game and just used it like it was a splat book expansion.
We played 2e with only some rules taken from skills and powers, sometimes more sometimes less.
same
So I just think you are overthinking it. Most people will just buy the newest books and use them side by side.
no they wont... some will pick and choose like we (both you and I by the sound of it) but nobody is going to have 1 character play by the 2014 rules and another by the 2024 rules without HEAVY houseruleing and player buy in
If one comes to a 2024 table with a 2014 book, they will most probably not turned away and they will find a solution.
right that solution is simple "update to the 2024 book" I would say 9 out of 10 but I bet MORE then that will just be "no we use this book update to it"
it is no different then showing up to a Pathfinder 1e game with a 4e warlord... you wont be turned away but you have to remake the character.
I think people on the internet are making a mountain out of a molehill...
it is neither a mountain or a mole hill... it's a new version fo the game. It's the same divide we have always called editions and in last 20 year include 'half editions" or .5s
New books won't pose more of an issue than deciding if you use tashavs rules or not.
Actually I bet it will make less of a problem, as everyone will find a complete class in the 2024 book instead of many variant rules that need to be approved one by one.
that's the thing... if I make a Mountian dwarf bard with teh 2014 PHB I can still PLAY A mt dwarf bard... but I have to remake him useing the rules in the new book.
If I go to a 10 tables, 1 is playing 1e, 1 is playing 2e, 1 is playing 3.0, 1 is playing 3.5, 1 is playing 4e, 1 is playing 5e from 2014, 1 is playing 5e from 2024(or playtest), one is playing pathfinder 1e 1 is playing PF 2e, and one is playing level up... I can make a Dwarven cleric. I can name the character the same and have the same personality and back story... and I can say "I am playing D&D as a dwarf cleric"
What I can't do is transfer from 1 game to another without modifications.
Those modifications range from ground floor rewrite to make some class and race and spell changes and remember condition changed and some basics got adjusted...
2014 to 2024 is not the most change needed... but it is in teh same category as several of them