This is exactly what is not happening. Instead systems are being written that try very hard to force you to replace many tools with this new system, and the components of the new system do not maintain compatibility with the old interfaces.
> How exactly can you convince programs to work together if you don't write them together?
this is a core part of the problem
you make programs work together, not by writing them together, but by defining the interface between them. That way the different programs can be written by different people at different times, replaced one by one, etc
That is the way to have a long-term robust solution.
If you consider that all the programs need to be written together, it's a very small step to consider that you can break all your old interfaces because you ship all new versions of everything.
Linux desktop environment projects are following this logic, and users quite rightly complain when major changes happen that break how they used to work, and make it so that you can't use old components that work great for you with the new version.
APIs need to be defined, and you need to support old ones going forward.
you do NOT need to write all your programs together
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