Decreasing compatiblitiy of OS4 a good thing?

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As a question: I am not really sure about the issue of moving forward.
If OS4 becomes "differently compatible" in the future, why is it so problematic for some people?

The current version of OS4 won't suddenly stop working! If any incompatibility arises a second partition on the internal storage with AmigaOS 4.1 Final Edition Update 3 will "fix it".

Then there are all the "Misters" and "Misses" and Vampires and #?A(6|12)00#? out there, that can run AmigaOS 3.3. So what is the problem?
Our current "NG" hardware should be NG.
No need to cripple it just for the sake of wanting to use 68k software.

Maybe I am alone here, but I would like to use my X1000 and X5000 and the coming Mirari at full potential. With all the cores available on the CPU-die.
And I would really like to have a system that does not "GrimReap", partially freeze and then leaves me with no possibility to save my work because the mouse and keyboard stopped working.

Stability has come a good way, but we are not there yet. Especially when running 68k software.

I am not a developer, but a fairly modern Webbrowser seems really improbable to me when I read about all the hurdles on the way. The endianness, Unicode, memory protection, and I think it is a matter of time until we are at a wall again with 32bit vs 64bit.
About the memory there is this Extended Memory Object, yes, but it somehow feels as a clumsy patch to me.

I read so often that "we" would like to watch movies and watch YouTube (or whatever streaming platform) but how do we achieve this with one core on a (here some cheers for you all PPC-is-dead aficionados) 10-years-old-dead-PPC-Processor?
Using 6 years old Graphicscards?
They are starting to post 8k video on YouTube, 4k becoming quasi-standard.
And besides videos, there really is the need of raw-power to decode some websites today!

Either you all folks have hope and believe new Amiga-hardware will be released with a super duper mega processor with Mega-giga-performance on _one_ single one of its x-cores, or we should hope that the OS will make full use of our still powerful "dead PPC "double or quad-core processors.

@kas1e

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Yes, I remember, thank for the clarification.

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I indeed would like 64bit, unicode, proper multicore support and whatever magic to make the system stable, with the mouse and keyboard (so the USB-stack) working. More then a couple of times the keyboard/mouse stop working while I can see the clock ticking, but no way to do anything.
Or the GrimReaper showing up, and then it's better to not click it, but close everything and reboot. Because clicking on "kill app" will brings the system down anyway.

I concur with you with sandboxing 68k and make it easier for developers to develop, debug and port software.

Also like many here, I don't want a Linux "clone". I think the NG-kernel which is been worked on, is a good thing.