For example: we have 4K monitors now, and 8K monitors soon. OSes before ~2010 didn't really support DPI scaling (with mixed-DPI display layouts, etc.), because we didn't have those monitors; but now we do. OSes had to add DPI scaling support throughout the whole stack to support these monitors in the way people expected.

This required a nontrivial rearchitecting of the components of some OSes, because they had been built in a world where you rendered e.g. fonts by caching fixed bitmap tile-handles with the (non-DPI-aware) pixel size of the font as the key. In the case where you have two monitors of differing DPI plugged in, that cache spits out wrong tiles for at least one of your monitors.

So, what would you expect this "stable" OS to do when you plug an 8K monitor into it?

Or, another example: touchscreen tablet support, implemented by pen and gesture input events becoming the lower-level input-event stream, and pointer events being reimplemented on top of them. What would you expect your stable OS to do if you installed it on a tablet?

Sometimes, OSes have to rearchitect things. The reason is not always "FEATURE: now written in a cool new language!"; sometimes it's "BUG: it just doesn't got-dang work to do things this way any more."

Out of curiosity, why would you associate it with atheism? Since many (most?) Christian denominations believe it's forbidden to curse in God's name, it's actually more likely to have theistic origins.

I don't think it's a signal either way as to belief or nonbelief, though. It's more likely to just be a part of their vernacular.

Finally, as an atheist I can tell you that I have no need to avoid using the word "god". What's it going to do, cause a god to pop into existence if I say the name thrice? :) That would certainly be interesting.